Meaning of "tell" in Essential American English Dictionary

tell

verb us /tel/ (past tense and past participle told)

A1 to say something to someone, usually giving the person information:

He told me about his new school.
tell someone to do something

A2 to order someone to do something:

I told you to stay here.
can tell

to know something from what you hear, see, etc.:

You could tell that he was tired.

(Definition of “tell” from the Webster's Essential Mini Dictionary © Cambridge University Press)