dū nong
to mutter
to mumble complaints
to grumble
dū lu
bunch
cluster
classifier for bunched objects
to hang down in a bunch
to droop
dū dū chē
tuk tuk (three wheeler taxi) (loanword)
dū dū xiǎng
(onom.) toot
honk
beeping
tooting noise
dū dū nóng nóng
to mumble in whispers
to mutter to oneself
dū nong bù píng
to constantly complain (idiom)