ph.

1. 保住（工作或位置）
If you hold down a job or a place in a team, you manage to keep it.

2. 压制;限制
If you hold someone down, you keep them under control and do not allow them to have much freedom or power or many rights.

1. restrain

e.g. please hold down the noise so that the neighbors can sleep

2. keep

e.g. She manages to hold down two jobs