engine run-up operation

engine ground run / run-up

engine ground run / engine test

engine capacity / engine power, engine output

engine run-up area

engine start-up and run-up

clandestine operation; covert operation

humanitarian operation; humanitarian relief operation (HUMRO)

PZ operation (pick-up zone operation)

noncombatant evacuation operation (NEO); non-combat evacuation operation

underwater operation of engine

cut-off engine operation

rough engine operation

idling engine operation

reaction engine / motor (jet engine)

rotary engine (Wankel engine)

engine oil reservoir / engine oil tank

airbreathing jet engine / ducted jet engine

dry run

dummy run

hit and run battle

hit and run tactics

physical endurance run

raise / run the blockade

run (naut.)

run in

run-flat (tire)

takeoff run

Willow Run Research Center

run into opposition

run out of ammo

bottom run (of tank track)

day's run