tell on

tell on (http://definr.com/tell on)

     v 1: give away information about somebody; "He told on his
          classmate who had cheated on the exam" [syn: denounce,
           betray, give away, rat, grass, peach, shit,
           shop, snitch, stag]
     2: produce an affect or strain on somebody; "Each step told on
        his tired legs"