1.rap的基本意思是在关节等坚硬的表面上连续急敲,并发出尖厉的、短促的、连续的声音。引申可表示说话快速,如同敲打声音一样。
2.rap是不及物动词,一般须和介词或副词连用。
3.rap的过去式和过去分词均为rapped。

rap at(v.+prep.)
敲击或拍打beat on; give blows on; make a noise on sth such as a door, often with sth hard
▲rap at sth
There's someone rapping at the door; see who it is, will you?有人在敲门,你去看看是谁,好吗?
We rapped at the door, but there was no answer.我们笃笃地敲门,但无人回答。
It's only a branch rapping at the window, that's all.只是树枝在敲打窗户,没别的。

rap for(v.+prep.)
因…而厉声斥责某人 speak severely to sb for sth
▲rap sb for sth
The judge rapped the police for their treatment of the witness.法官因警察对待证人的态度而厉声斥责他们。

rap on(v.+prep.)
在坚硬的表面上敲击beat on sth such as a surface with sth hard
▲rap on sth
Rap on the wall with the heel of your shoe, someone will surely hear and let us out.用你的鞋跟敲墙,准会有人听到这声音并放我们出去的。
The chairman rapped on the table for order.主席敲桌子要求安静。

rap out(v.+adv.)
▲rap sth ⇔ out
1.以连续的敲击声来表达knock repeatedly to send a message
Keep silent, and the Spirits will rap out a message for you.请安静,神灵将用敲击声给你们以启示。
2.突然说或厉声说…say sth suddenly and sharply
The officer rapped out an order, and all the soldiers raised their guns.军官厉声下了个命令,士兵们全举起枪。

rap with(v.+prep.)
▲rap with sb/sth
1.用…敲击knock using sth
Rap with your feet, someone will surely hear.用你的脚敲,准会有人听到这声音。
2.随便交谈,交换意见talk with sb informally, as to exchange opinions
You can learn a lot by rapping with people who you think might be your enemies.通过与你认为可能是你敌人的人交谈,你能学到许多东西。

rap, knock, tap
参见knock条。

rap还可用作名词,意思是“叩击, 轻拍, 轻敲; 斥责”。