push back

Short definition from Wiktionary

Noun

1. 1
   Alternative spelling of pushback.
2. 2
   Alternative spelling of pushback.

Verb

1. 1
   To refute or argue against a position or an accusation; to express one's own view on a situation.
2. 2
   To postpone.
3. 3
   To summarily expel asylum seekers, especially in violation of the principle of non-refoulement.
4. 4
   Used other than figuratively or idiomatically: see push, back.