|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
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.