'wash down' definitions:

Definition of 'wash down'

(from WordNet)
verb
Eat food accompanied by lots of liquid; also use metaphorically; "She washed down her dinner with a bottle of red wine"; "He washes down his worries with a nightly glass of whisky"
verb
Flow freely; "The body washed down the river" [syn: wash down, flush down]

Synonyms of 'wash down'

From: Moby Thesaurus