Hark

Verb

 * 1) To listen attentively; often used in the imperative.

Thesaurus
NB, attend, attend to, auscultate, be all ears, bend an ear, bug, cock the ears, eavesdrop, examine by ear, give attention, give audience to, give ear, give ear to, hear, hear out, hearken, hearken to, heed, intercept, lend an ear, listen, listen at, listen in, listen to, mark, mind, note, notice, remark, sit in on, tap, wiretap