- to make or become calm or calmer
Collins Concise English Dictionary © HarperCollins Publishers::
tranquillize, tranquillise, US tranquilize /ˈtræŋkwɪˌlaɪz/ vb
tran•quil•ize or tran•quil•lize /ˈtræŋkwəˌlaɪz/USA pronunciation
v. [~ + object], -ized or -lized, -iz•ing or -liz•ing.
WordReference Random House Unabridged Dictionary of American English © 2026- to make tranquil, as by giving a drug to:The veterinarian tranquilized the dog with an injection.
tran•quil•ize
(trang′kwə līz′),USA pronunciation v.t., v.i., -ized, -iz•ing.
[esp. Brit.,] tran′quil•lise′.
tran′quil•i•za ′tion, n.
- to make or become tranquil.
[esp. Brit.,] tran′quil•lise′.
- tranquil + -ize 1615–25
'tranquillize' also found in these entries (note: many are not synonyms or translations):