1. 开始,着手：enter into 进入;参加;开始从事 | enter upon 开始,着手 | equip with 装备,配备

2. 开始：enter up 登记 | enter upon 开始 | Enter 输入

3. 开始着手做某事：The teacher enters him for the examination. 老师帮他报名参加了比赛. | enter upon 开始着手做某事 | The president has just entered upon another term of office. 总统刚刚开始另一个任期.

verb

1. take possession of

e.g. She entered upon the estate of her rich relatives

Synonym: come uponluck into