■ verb make a continuous low humming sound.
↘speak tediously and at length: Jim ~d on for an hour.
■ noun
1》 a low continuous humming sound.
↘a pipe (especially in a set of bagpipes) or string used to sound a continuous note of low pitch.
2》 a male bee which does no work in a colony but can fertilize a queen.
↘an idle person.
3》 a remote-controlled pilotless aircraft.
Origin
OE drān , drn 'male bee', from a W. Gmc verb meaning 'resound, boom'.