push against an open door
From Wiktionary, the free dictionary
Alternative forms
- push against open doors
Pronunciation
Audio (General Australian): (file)
Verb
push against an open door (third-person singular simple present pushes against an open door, present participle pushing against an open door, simple past and past participle pushed against an open door)
- (idiomatic) To do something pointless or unnecessary; to try doing something already done.
- Synonyms: preach to the choir, preach to the converted
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