Definition of push back phrasal verb from the Oxford Advanced Learner's Dictionary

 

push back

 phrasal verb
phrasal verb
 
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Phrasal Verbs

push back (on something)

(especially North American English)
 
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to oppose or resist a plan, an idea or a change The company has tried to push back on the claim that it paid no taxes.
to make the time or date of a meeting, etc. later than originally planned The start of the game was pushed back from 2 p.m. to 4 p.m.
See the Oxford Advanced American Dictionary entry: push back