hook用作名词时意思是“钩”,转化为动词时可表示把某物弯成钩形,也可表示用弯曲的东西把某物体钩住,引申可表示为“吊”“挂”等。

hook up(v.+adv.)
装好,扣住; 接通fasten (with hooks); connect to sth
▲hook sth ⇔ up
You can hook up the dress at the back.你可以把女衫从背后扣住。
The electrician hooked up the doorbell.电工装好了门铃。
◇ 用于be ～ed 结构
The gas was hooked up.煤气已装好并接通。

用作不及物动词
▲S+～(+A)
This skirt hooks on the side.这件裙子在侧面有钩扣住。
The coat hooks in the front.这件上衣在前面系扣。
用作及物动词
▲S+～+n./pron.
He hooked his arm round her neck and pulled her head down.他一只胳膊弯成钩形,搂在她的脖子上,把她的头拉低。
He hooked a large fish.他钓了一条大鱼。
They couldn't hook that dummy torpedo.他们未能钩住那枚假鱼雷。
Hook the window when you come in.你进来时把窗户扣好。

by hook or by crook
千方百计,不择手段by any means
I'll get her to marry me, by hook or by crook.我要想方设法让她同我结婚。

off the hook
1.未挂上not replaced
He left the phone off the hook so that he wouldn't be disturbed.他不把电话挂上,以免受到打扰。
2.摆脱困境no longer in a position of difficulty
He counted on his friends to get him off the hook.他指望朋友们帮他摆脱困境。

Hang your coat on the hook.把你的外衣挂在钩上。
The man wrenched the hook out of the bleeding mouth of the fish.那个人从淌着血的鱼嘴上猛地把渔钩拉了下来。
He delivered a right hook to his opponent's jaw.他给了对方下巴一记右钩拳。
The driveway makes a hook around an old tree.车道绕过一棵老树来了个急转弯。