weak sister
Proposed by a contributor, not yet supported by evidence.
Meaning · English
A person or thing that is ineffective or incompetent
Nghĩa · Tiếng Việt
một người hoặc điều gì đó không hiệu quả hoặc không có khả năng
Machine-translated — suggest a fix
Literally: a sister who is weak
Where it’s used:
Used
Widespread English
Examples
The company's marketing department is the weak sister of the organization
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 “weak sister” mean?
A person or thing that is ineffective or incompetent Literally: a sister who is weak
Is “weak sister” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.