(astronautics) A small, auxiliary rocket engine or motor onboard a spacecraft that provides enough acceleration to settle propellant in a tank.

(simile, slang, archaic) Very ugly.

Alternative spelling of UN

(dated) Synonym of pressure ulcer.

(US, measurement, geodesy) A measurement unit for distance; the standard foot for surveying in the United States from 1893 to 2022; having a value of 1200/3937 metres (0.3048006096m). The US Survey Foot was replaced by the ISO standard international foot from 2022.

Synonym of ultimate frisbee

Third-person singular simple present indicative form of pay the ultimate price

simple past tense and past participle of pay the ultimate price

present participle of pay the ultimate price

To die as a result of a fatal choice or decision, or because of deep commitments.