Longman Dictionary of Contemporary English
squirt gun
noun
EXAMPLES FROM CORPUS
▪ It no longer resembled the little squirt gun that Mrs Witherspoon had once cupped in her palm.
Wiktionary
squirt gun
n. A toy gun used to shoot water.
WordNet
squirt gun
n. plaything consisting of a toy pistol that squirts water [syn: water pistol, water gun, squirter]