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!."