表示“阻止某人做某事”。

Keep sb. from doing sth.

也是阻止某人做某事的意思。

Forbid sb. to do sth. forbid sb. to do sth.

阻止某人做某事。

Stop sb. from doing sth.

“To hamper someone”的意思是“阻碍某人”——阻止某人做某事。

To hamper someone means to get in their way — to prevent them from doing something.