How to Use Copilot Prompts for Translating Idioms Across Languages

Translating idioms literally often produces confusing or nonsensical results. For example, the English idiom kick the bucket has nothing to do with kicking a pail. Business users who work with international teams need accurate translations that preserve the intended meaning. Copilot in Microsoft 365 can handle this task when you use the right prompts. This article explains how to structure prompts that make Copilot translate idioms correctly across languages.

How Idioms Break in Machine Translation and Why Copilot Needs Structured Prompts

Idioms are phrases where the collective meaning differs from the literal word meanings. Standard machine translation engines, including the base models behind Copilot, tend to translate word by word. When you type a literal request like translate this idiom into Spanish, Copilot may output a word-for-word string that sounds unnatural to native speakers.

The root cause is that Copilot does not automatically detect whether a phrase is idiomatic. It treats the input as plain text unless the prompt explicitly flags it as an idiom. Additionally, idioms often have no direct equivalent in the target language. For instance, the French idiom appeler un chat un chat translates literally to call a cat a cat, but the English equivalent is call a spade a spade. Without a prompt that asks for the equivalent idiom, Copilot may return the literal version.

Another factor is regional variation. The same idiom can have different equivalents in European Spanish versus Mexican Spanish. Copilot does not default to a specific regional variant unless you specify it in the prompt. Structured prompts solve all these issues by giving Copilot clear instructions on what to do.

Structuring the Prompt for Idiom Translation

The prompt must contain three elements: the idiom itself, the target language, and an instruction to provide the equivalent idiom plus a literal explanation. Below are the exact steps to build such a prompt in Copilot.

1. Open the Copilot pane
   In Microsoft 365, open any app such as Word, Outlook, or Teams. Click the Copilot icon in the ribbon or sidebar to open the chat pane.
2. Set the target language
   In the Copilot pane, locate the language or region setting if available. For Copilot in Microsoft 365, the language is inherited from the app language. To override it, include the target language in the prompt explicitly.
3. Write the idiom translation prompt
   Use this exact structure: Translate the English idiom “[idiom]” into [target language]. Provide the equivalent idiom in [target language] and then explain its literal meaning in English.
   Example: Translate the English idiom “break the ice” into German. Provide the equivalent idiom in German and then explain its literal meaning in English.
4. Add context for better accuracy
   If the idiom is used in a specific situation, add a context clause. Example: This idiom is used in a business meeting introduction. Translate the English idiom “break the ice” into German. Provide the equivalent idiom in German and then explain its literal meaning in English.
5. Review and refine the output
   Copilot will output the equivalent idiom and the literal explanation. If the output looks like a word-for-word translation, add the phrase do not translate literally to the prompt. Example: Translate the English idiom “kick the bucket” into French. Do not translate literally. Provide the equivalent idiom in French and then explain its literal meaning in English.

Using Copilot to Translate Idioms in Bulk or in Documents

For longer documents or multiple idioms, use Copilot in Word or Outlook with a document-level prompt. The approach differs slightly from the single-idiom method.

1. Select the text containing the idiom
   In Word, highlight the sentence or paragraph that includes the idiom.
2. Open Copilot and choose the rewrite option
   Click the Copilot icon and select Rewrite or Translate depending on your version. If the default translation is too literal, use the chat pane instead.
3. Issue a replacement prompt
   In the chat pane, type: Replace the idiom in the selected text with its equivalent in [target language]. Explain the meaning of the original idiom in a footnote.
   This method works well for business documents where you want to preserve the original text but add a translation note.

If Copilot Returns a Literal Translation Instead of the Idiom Equivalent

Copilot gives a word-for-word translation of the idiom

This happens when the prompt does not explicitly instruct Copilot to find an equivalent idiom. The fix is to add the phrase provide the equivalent idiom in [target language] and remove any ambiguity. Also ensure the target language name is spelled correctly, for example Spanish instead of Spanish language.

Copilot returns the correct idiom but in the wrong regional variant

Specify the region in the prompt. For example, instead of Spanish, write Mexican Spanish or Spanish as spoken in Spain. Copilot uses the regional qualifier to adjust its output. Test the output with a native speaker if accuracy is critical.

Copilot does not recognize the phrase as an idiom

Some idioms are less common and Copilot may treat them as literal statements. Add the word idiom at the start of the prompt. Example: Idiom: “spill the beans.” Translate this idiom into Italian and provide the equivalent idiom. This change forces Copilot to treat the input as a non-literal phrase.

Copilot Single Prompt vs Copilot Document Rewrite for Idiom Translation

Item	Single Prompt	Document Rewrite
Best for	One idiom at a time	Multiple idioms in a single document
Prompt complexity	Low; one clear instruction	Medium; must reference selected text
Output format	Equivalent idiom plus literal explanation	Replaces text in document with footnote
Language setting	Specify in prompt	Inherits from document or prompt
Risk of literal translation	Low with proper prompt	Higher if prompt lacks idiom instruction

The single prompt method gives you more control over the output. Use it for emails or chat messages where you need a quick, accurate idiom equivalent. Use the document rewrite method when you are editing a long report or proposal and want to keep the original text visible alongside the translation.

You can now translate idioms across languages using structured Copilot prompts. Start by testing the single prompt method with one idiom before moving to document-level rewrites. For best results, always include the literal explanation request in the prompt so you can verify the meaning matches the original idiom.