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Phrase(s): Bottoms up! [and] Here’s looking at you.; Here’s mud in your eye.; Here’s to you.
Inf. an expression said as a toast when people are drinking together. (Alludes to the bottoms of the drinking glasses.) • Bill: Bottoms up. Tom: Here’s mud in your eye. Bill: Ah, that one was good. Care for another?
McGrawhill's American Idioms And Phrasal Verbs