coffin corner

Short definition from Wiktionary

Noun

1. 1
   The position in a formation of ships or bombers that is most exposed to enemy fire.
2. 2
   A situation in which the aircraft cannot increase or decrease its airspeed without stalling or buffeting.
3. 3
   A corner of the field formed by the opponent's goal line and a sideline, into which a punt is often aimed in order to force the opposition to play close to their goal line.
4. 4
   Used other than figuratively or idiomatically: see coffin, corner.