fall back

відходити, відступати (The enemy, falling back before us, took advantage of every position. - ‘My Early Life’ by Winston Churchill)

fall of shot calibration (fall-of-shot calibration)

fall back to a new line

back-to-back circuit

back-to-back connection

back-to-back radio stations

back-to-back relay

fall of the hammer

free fall air drop

fall of shot to side of target

spring and fall grade gasoline

defenses fall apart

fall before the enemy

fall behind time

fall for formation

fall into column

fall into disorder

fall prisoner (of war)

fall upon successive prepared positions