duck back

(знову, в черговий раз) різко відхилятися; ухилятися; уникати будь-кого або будь-що (напр. бою) (He would lean out just long enough to take aim and shoot, then duck back behind the corner. - Bowden, Mark. `Black Hawk Down` - p. 103)

duck gun (duck-gun)

cotton duck harness

back-to-back circuit

back-to-back connection

back-to-back radio stations

back-to-back relay

back-up fire control

cut back co-operation

reverse engineering ( back- wards engineering)

Camel-back water pouch

Field Pack, Air Support Back

back brief / backbrief

back on the block

back-up circuit breaker

armor back plate

back bearing housing