Meaning of “trouble” - Learner’s Dictionary

trouble

noun uk us /ˈtrʌbl/
PROBLEMS [ C, U ]

B1 problems, difficulties, or worries:

She's been having a lot of trouble with her boss recently.
I'd like to go to the party, but the trouble is my parents won't let me.
the trouble with sb/sth

B2 used to say what is wrong with someone or something:

The trouble with a white floor is that it gets dirty so quickly.
The trouble with John is that he doesn't think before he speaks.
NOT WORKING [ U ]

a problem that you have with a machine or part of your body:

back trouble
car trouble
FIGHTING [ U ]

B2 a situation in which people are fighting or arguing:

The trouble started after a group of drunken football fans started to throw bottles.
DIFFICULT SITUATION [ U ]

B2 a difficult or dangerous situation:

The company was in trouble and had huge debts.
PUNISHMENT [ U ]

B1 a situation in which you have done something wrong and are likely to be punished:

Her children are always in trouble.
They got into trouble with the police.
EXTRA WORK [ U ]

B2 a situation in which you use extra time or energy to do something:

[ + to do sth ] He took the trouble to write to each of them personally.
"Would you like to have a meal with us?" "Only if it's not too much trouble."

(Definition of “trouble noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)