Have One's Ears Lowered Meaning

(idiomatic, humorous, dated) To get a haircut.

Example: 2006 June 25, "Cutting to the Chase at Barber Shop," New York Daily News:
  When you need a haircut, you go to a barber, so here I am at Tommy's Bronxville's tonsorial prepared to get clipped. Or, as we said as kids, have my ears lowered.