n (1)龙头，旋塞(tap or valve for regulating the flow of a liquid or gas in a pipe)[C]：turn on/off the～打开/关上龙头;〖同〗tap;

(2)(枪)扳机(hammer of a gun)[C];

v (1)扣扳机(draw back(the hammer of a gun)ready for firing)[T+n]：The soldiers～ed their rifles. 士兵们扣动步枪的扳机。〖反〗uncock;

(2)竖起(cause sth to be upright or lift)[T+n，T+n+prep，T+n+adv(up)，I+adv(up)]：The dog～ed its ears/hind leg.狗竖起耳朵/抬起后腿。The horse's/dog's ears～ed up.(The horse/dog～ed its ears up.)马/狗的耳朵竖了起来。(马/狗竖起了耳朵。)〖同〗raise;

(3)使倾(歪)斜(cause sth to tilt up or to one side)[T+n，T+n+prep]：～one's hat/one's head歪戴着帽子/歪着头;The bird～ed its head to/on one side.那鸟把头偏向一边。