that's done it
Proposed by a contributor, not yet supported by evidence.
Meaning · English
Something has gone terribly wrong or caused a big problem.
Nghĩa · Tiếng Việt
Có điều gì đó đã đi sai hoặc gây ra vấn đề lớn
Machine-translated — suggest a fix
Literally: that action has finished it
Where it’s used:
Used
Widespread English
Examples
I just spilled coffee all over the report, that's done it.
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 “that's done it” mean?
Something has gone terribly wrong or caused a big problem. Literally: that action has finished it
Is “that's done it” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.