[dumb bunny] {n.}, {slang}, {informal} Any person who is gullible and […]

[dumbwaiter] {n.} A small elevator for carrying food, dishes, etc., from […]

[dumps] See: [DOWN IN THE DUMPS] or [DOWN IN THE MOUTH].

[dun] "Don't"; commonly used by Singaporeans.

[dunno] "(I) don't know"

[dust] See: [BITE THE DUST], [KICK UP A FUSS] or [KICK […]

[dust off] {v.}, {informal} 1. To get ready to use again. […]

[Dutch] See: [BEAT ALL] or [BEAT THE DUTCH], [GO DUTCH], [IN […]

[dutch treat] {n.}, {informal} A meal in a restaurant or an […]

[duty] See: [DO DUTY FOR], [DOUBLE DUTY], [HEAVY DUTY], [OFF DUTY], […]