Definitions

1. contraction

the auxiliary verb ‘should’ used with the negation ‘not’ to express doubt or uncertainty about what should be done

“She shouldn’t have eaten the whole cake by herself.”

2. verb

to believe or think that something should or should not be done, especially because of moral or social rules

“You shouldn’t trust strangers on the internet.”

3. interjection

used to express disagreement or disapproval

“You shouldn’t do that!”