1.
There is a vast difference between sitting against a horse when he is on the bit and riding him out when he is off the bit.
勒紧缰绳稳住马跟放松缰绳纵马飞奔大不一样。
2.
give sb. one's head
放松缰绳, 让某人自由行动
3.
let sb. have his head (=give sb. his head)
"放松(马的)缰绳; 不对某人施加约束, 听任某人自由行动"
4.
The horses, feeling slack reins, stretched down their necks to crop the tender spring grass.
那几匹马觉得缰绳放松了，便都低下头去嚼那柔嫩的春草。
5.
The thief gave all the horses a bridle.
小偷给所有的马放了缰绳。
6.
piece of metal held in horse's mouth by reins and used to control the horse while riding.
放在马嘴中当缰绳用于骑马时控制马。
7.
He dropped the reins and heaved on the brake.
他放下缰绳，猛地拉住车闸。
8.
The young Mongolian girl dropped her bridle and let the horse drink of the running water.
年轻的蒙古姑娘放掉缰绳,让马喝些水。
9.
He put the reins in her hand, and folded his arms.
他把缰绳放在她手里，自己两手一抱，坐在一旁。
10.
To let out or release(a line or an anchor train).
放开或放松（缆绳或锚等）
11.
To let out(a line or cable) by slackening.
慢慢放松通过松开使（绳索或缆绳）脱出
12.
stop or check by or as if by a pull at the reins.
以缰绳停止或者勒制或使劲拉缰绳。
13.
To let out(a line or rope) by slackening.
缓缓放松通过放松使（绳或索）放出
14.
I let go the rope by the run.
我迅速放松那绳索。
15.
Give the rope more play.
把绳子再放松点儿。
16.
Release the rope more.
把绳子再放松一点。
17.
To set free by removing bands or braces.
放松解开绳带或背带
18.
He let go of the rope.
他松手放开了绳子。