What is "brushup"

Usage examples of "brushup".

He attended brushup sessions in shock focus rooms like the one on the Island and he waited for his time.

Bill Snipes, and take Zack and Jeffry to Sharon Ludlow for their monthly brushup and tick check while Mildred has her hair done by Margo Snead at the Coiffe Shoppe and then undergoes aromatherapy with Cathie Bayless for an hour.

I found a shiny surface to give myself a quick brushup and then I went to tap on the door.