dissipate

Etymology

From Middle English dissipaten, from Latin dissipātus, past participle of dissipāre, also written dissupare (“to scatter, disperse, demolish, destroy, squander, dissipate”), from dis- (“apart”) + supāre (“to throw”), also in comp. insipāre (“to throw into”).

verb

1. (transitive) To drive away, disperse.
   August 1773, James Cook, journal entry I soon dissipated his fears.
   The extreme tendency of civilization is to dissipate all intellectual energy. 1817, William Hazlitt, The Round Table
2. (transitive) To use up or waste; squander.
   So much for the effort and ingenuity of Montmartre. All the catering to vice and waste was on an utterly childish scale, and he suddenly realized the meaning of the word "dissipate"—to dissipate into thin air; to make nothing out of something. 1931, F. Scott Fitzgerald, Babylon Revisited
   If he prefers the bar he can exchange views with a Major de Wildman of Lord knew whose army, who calls himself King Farouk's equerry and claims to have a private telephone link to Cairo so that he can report the winning numbers and take royal orders inspired by soothsayers on how to dissipate the wealth of Egypt. 1986, John le Carré, A Perfect Spy
3. (intransitive) To vanish by dispersion.
4. (physics) To cause energy to be lost through its conversion to heat.
   The traction motors serve as generators when dynamic braking is used, the generated output being dissipated in fan-cooled resistance banks mounted in a removable roof section. 1960 April, “English Electric diesels for the Sudan Railways”, in Trains Illustrated, page 218
   Regenerative braking is retained. Like rheostatic braking, this uses the traction motors to provide a braking effort, but the current developed is fed back into the overhead catenary rather than dissipated through resistance banks. July 26 2023, David Clough, “Technology progression defines Class 93”, in RAIL, number 988, page 54
5. (intransitive, colloquial, dated) To be dissolute in conduct.