English · Idiom Candidate

sit in

Proposed by a contributor, not yet supported by evidence.

Both English Tiếng Việt

Meaning · English

Attend a meeting or class as an observer

Nghĩa · Tiếng Việt

tham dự một cuộc họp hoặc lớp học như một người quan sát

Machine-translated — suggest a fix

Literally: be seated in

Where it’s used: Used Widespread English

Examples

I'll sit in on the lecture to learn more

AI-drafted example auto-approved by rule (illustrative, not a corpus attestation)

Sources & notes

Listed in Wiktionary’s “English idioms” category (retrieved 2026-07-29); definition pending editorial review. Definition drafted by AI (@cf/meta/llama-3.3-70b-instruct-fp8-fast) and auto-approved by rule on 2026-07-31; pending editor spot-check.

Common questions

What does “sit in” mean?

Attend a meeting or class as an observer Literally: be seated in

Is “sit in” formal or informal?

No register label has been reviewed yet — treat it as neutral and check the usage notes above.

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