1.VerbCannot (negative auxiliary); be unable to; not have the ability to (whether due to lacking relevant strength or skill or knowledge or supplies, or due to logical impossibility, etc).
"I can’t quite get it to work.; Shut up, can’t you?; The butler can’t be the murderer — he can't have killed her — because he was in London that evening."
2.VerbTo be forbidden to; to be not permitted to.
"You can’t enter the hall without a ticket."
3.VerbTo be unwilling to; to not have the desire of; to don’t want to.
"Will you come to dinner with us tonight? Can't; already have plans this evening."