Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: Probably from slop + slush


1 [intransitive,transitive always + adverb/preposition] if a liquid sloshes somewhere, or if you slosh it, it moves or is moved about in an uncontrolled way
slosh around/about
Water was sloshing about in the bottom of the boat.
He put the glass down hard and beer sloshed over the edge.
2 [transitive always + adverb/preposition] to put a liquid in a container or on a surface in a careless way:
Jo sloshed more wine into her glass.
Slosh a bit of paint on.
3 [intransitive always + adverb/preposition] to walk through water or mud in a noisy way:
People were sloshing around in the mud.

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