Also called sonic barrier, transonic barrier. (not in technical use) a hypothetical barrier to flight beyond the speed of sound, so postulated because aircraft undergo an abruptly increasing drag force induced by compression of the surrounding air when traveling near the speed of sound.
break the sound barrier, to travel faster than the speed of sound.
(not in technical usage) a hypothetical barrier to flight at or above the speed of sound, when a sudden large increase in drag occurs Also called sonic barrier, transonic barrier
The sharp increase in drag experienced by aircraft approaching the speed of sound. Also called sonic barrier.
a movement made by lifting the foot and setting it down again in a new position, accompanied by a shifting of the weight of the body in the direction of the new position, as in walking, running, or dancing. such a movement followed by a movement of equal distance of the other foot: The soldier […]
break the back To do the hardest part, or most, of a job (1890+) To make ineffective; cripple: The UN’s mission is to break the back of the warlords in Somalia (1970s+)
the rear part of the human body, extending from the neck to the lower end of the spine. the part of the body of animals corresponding to the human back. the rear portion of any part of the body: the back of the head. the whole body, with reference to clothing: the clothes on his […]