Meaning of “shouldn't” - Learner’s Dictionary

shouldn't

us uk /ˈʃʊdənt/
Extra Examples
You shouldn't keep a dog chained up like that.The children shouldn't be in any danger as long as they use their common sense.I know he's annoying, but you shouldn't let him get to you.He shouldn't treat you like that. Don't let him get away with it.You shouldn't feel embarrassed about making a mistake.

short for should not:

I shouldn't have said that.

(Definition of “shouldn't” from the Cambridge Learner’s Dictionary © Cambridge University Press)