Definition of "Tell" :

noun: a Swiss patriot who lived in the early 14th century and who was renowned for his skill as an archer; according to legend an Austrian governor compelled him to shoot an apple from his son's head with his crossbow (which he did successfully without mishap)

verb: mark as different

verb: discern or comprehend

"He could tell that she was unhappy."

verb: give instructions to or direct somebody to do something with authority

verb: let something be known

"Tell them that you will be late."

verb: narrate or give a detailed account of

"Tell what happened."

verb: give evidence

"He was telling on all his former colleague."

verb: express in words

"Tell me what is bothering you."

verb: inform positively and with certainty and confidence

"I tell you that man is a crook!."