to hang loosely, or to hold something so that it hangs loosely

Loose electric wires were dangling from the wall. 松散的电线从墙上垂了下来。

He dangled the puppet in front of the children. 他在孩子们面前耍木偶。

to offer someone something that they want in order to persuade that person to do something

I've tried dangling all kinds of offers in front of him to get him to work harder at school, but nothing works. 为了让他学习用心点儿，我曾试过种种许诺，可是根本不起任何作用。