/
duːʃ/
n.
 a shower of water. 
▸a jet of liquid applied to part of the body for cleansing or medicinal purposes.
 ▸a device for washing out the vagina as a contraceptive measure.
v.
 spray or shower with water. 
▸use a contraceptive douche.
Etymology
C18: via Fr. from Ital. doccia ‘conduit pipe’.