To Trouble

1. (transitive, now rare) To disturb, stir up, agitate (a medium, especially water).
2. (transitive) To mentally distress; to cause (someone) to be anxious or perplexed.
3. (transitive) In weaker sense: to bother or inconvenience.
4. (reflexive or intransitive) To take pains to do something.
5. (intransitive) To worry; to be anxious.