no obj.
1- make a continuous low humming sound嗡嗡叫, 嗡嗡响：
in the far distance a machine droned.
远处一台机器在轰鸣。
1.1
- speak tediously in a dull monotonous tone低沉单调地说：
he reached for another beer while Jim droned on.
吉姆还在唠叨时, 他伸手又拿了一瓶啤酒。
1.2
- with adverbial of direction move with a continuous humming sound嗡嗡地行进：
traffic droned up and down the street.
车辆轰隆轰隆地在街上来来往往行驶。
1
- a low continuous humming sound嗡嗡声：
he nodded off to the drone of the car engine.
他在汽车发动机的轰鸣声中打起了瞌睡。
1.1
- informal a monotonous speech〈非正式〉单调乏味的讲话：
only twenty minutes of the hour-long drone had passed.
长达一小时的单调讲话才进行了20分钟。
1.2
- a continuous musical note, typically of low pitch（音乐的）持续音; （尤指）持续低音。
1.3
- a musical instrument, or part of one, sounding such a continuous note, in particular (also drone pipe) a pipe in a bagpipe or (also drone string) a string in an instrument such as a hurdy-gurdy or a sitar奏持续低音的乐器; （乐器的）持续低音部分（尤指风笛的持续低音管或摇弦琴和锡塔琴的持续低音弦）。
2
- a male bee in a colony of social bees, which does no work but can fertilize a queen雄蜂, 公蜂。
2.1
- figurative a person who does no useful work and lives off others〈喻〉寄生虫, 懒汉。
3
- a remote-controlled pilotless aircraft or missile（遥控的）无人驾驶飞机（或导弹）。
词源
Old English drān, drǣn 'male bee', from a West Germanic verb meaning 'resound, boom'; related to Dutch dreunen 'to drone', German dröhnen 'to roar', and Swedish dröna 'to drowse'.