pin back वाक्य

Doing it at night without lights at low altitude, with little communication between the aircraft, is like two people trying to thread the same needle _ or put the pin back in a live hand grenade _ in an unlit room.
First possession : third and 9 from the Patriots'35, and Jason Taylor _ able to, as they say, " pin back his ears and go " _ slams Tom Brady for a 7-yard loss.
In the hospital, one of the wounded recounts how he recited Psalms to stay alert as he tried to put the pin back in a grenade he had intended to toss at enemies he thought were approaching as he lay face down in an alley.