plural of high-muck-a-muck

plural of high button shoe

plural of high yo-yo

(aviation, military) A dogfighting maneuver used by a rapidly-closing attacker to avoid an overshoot during a turn, involving pulling up into a climb to exchange airspeed for altitude and allow the attacker to make a slower, tighter turn and drop back down behind the defender.

plural of Lord High Admiral

plural of high speed steel

(idiomatic) To abandon somebody; to stop providing assistance at a crucial moment.

The form of the German language spoken from 1350 or 1500 to 1650 CE, successor to Middle High German.

plural of high-frequency gravitational wave

(physics, astronomy) gravitational radiation, in the megahertz to gigahertz region, which is proposed to have been produced by the Big Bang or by the collision of massive astronomical objects or artificially in the laboratory. Gravitational waves having frequencies higher than 100 kHz.