1. 闲逛;游荡
If you dawdle, you spend more time than is necessary going somewhere.

2. 慢吞吞地做;（在…上）磨蹭
If you dawdle over something, you spend more time than is necessary doing something.

1. hang (back) or fall (behind) in movement, progress, development, etc.

Synonym: lagfall backfall behind

2. waste time

e.g. Get busy--don't dally!

Synonym: dally

3. take one's time
proceed slowly

Synonym: linger