[usually in imperative] literary listen:Hark! He knocks
(hark at) British informal used to draw attention to someone who has said or done something considered to be foolish or silly:just hark at you, speaking all lah-de-dah!
hark back to
mention or remember (something from the past):if it was such a rotten holiday, why hark back to it?
[originally a hunting term, used of hounds retracing their steps to find a lost scent]
evoke (an older style or genre):paintings that hark back to Constable and Turner