Meaning of “splash out (sth)” - Learner’s Dictionary

splash out (sth)

UK phrasal verb with splash uk us /splæʃ/ verb [ I, T ]

to spend a lot of money on something that you want but do not need:

He splashed out on the best champagne for the party.
They splashed out over a thousand pounds on a new kitchen.

(Definition of “splash out (sth)” from the Cambridge Learner’s Dictionary © Cambridge University Press)