Pronunciation: (smär'tn),[key] —v.t. 1. to make more trim or spruce; improve in appearance (usually fol. by up): Try to smarten up your outfit. 2. to make brisker, as a pace.
3. to sharpen the judgment or broaden the experience of; educate (usually fol. by up): Someone has to smarten him up about dealing with people. 4. smarten up, a. to groom oneself: to smarten up before dinner. b. to become aware of one's mistakes, shortcomings, etc., and make efforts to correct them: If you don't smarten up, you're going to be out of a job.