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3. rinse mouth out

rinse mouth out

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rinse someone's mouth out (with soap)

 and wash someone's mouth out (with soap)

Fig. to punish one by washing one's mouth out with soap, especially for using foul language. (Usually a jocular threat.) If you say that again, I'll rinse your mouth out with soap. I will wash out your mouth if you swear.

See also: mouth, out, rinse