1. have a monkey on one's back : 毒瘾深；
2. get the monkey off : 戒除吸毒恶习；
3. have a monkey up the chimney : 房屋被抵押；
不及物动词
名词
1. 猴
A monkey is an animal with a long tail which lives in hot countries and climbs trees.
2. 淘气鬼;捣蛋鬼
If you refer to a child as a monkey, you are saying in an affectionate way that he or she is very lively and naughty.