under the gun
Definition from Wiktionary, the free dictionary
- (idiomatic) Under great pressure to perform.
He was under the gun to finish the project quickly.
- (poker) Of, pertaining to, or in the situation of first player to act on the first round of betting.
James will be under the gun for the first hand of the final table.
- (obsolete, military) Too close to be subject to artillery fire.