1. by compulsion : 强迫地;
2. upon compulsion : 被迫, 不得不;
名词
1. 强烈欲望;(难以克制的)冲动
A compulsion is a strong desire to do something, which you find difficult to control.
2. 强迫;强制
If someone uses compulsion in order to get you to do something, they force you to do it, for example by threatening to punish you if you do not do it.
1. using force to cause something to occur
e.g. though pressed into rugby under compulsion I began to enjoy the game
they didn't have to use coercion
Synonym: coercion
2. an urge to do or say something that might be better left undone or unsaid
e.g. he felt a compulsion to babble on about the accident
Synonym: irresistible impulse
3. an irrational motive for performing trivial or repetitive actions, even against your will
e.g. her compulsion to wash her hands repeatedly
Synonym: obsession