pushback

Short definition from Wiktionary

Noun

1. 1
   The act of repelling an enemy, etc.
2. 2
   A procedure in which an aircraft is pushed backwards away from the gate by some external force, usually a special tractor.
3. 3
   A reversal or reduction.
4. 4
   Criticism of or resistance to a proposal, stance, or event.
5. 5
   Summary expulsion of asylum seekers, especially when violating the principle of non-refoulement.