rinse out verb 2noun 1forms 4 verb2 •To clean (as the inside of a container) by washing it to remove residue. •To remove matter by rinsing with water.To rinse out hair conditioner. noun1 •An act of rinsing out.A hasty rinse out under the tap was all the attention he bestowed on the crockery; and five minutes' desperate energy with the broom resulted in most of the rubbish being deposited under the bed. — 1913 formsrinsed out · rinsing out · rinses out · rinse outs