overstaff

over- +‎ staff

overstaff (third-person singular simple present overstaffs, present participle overstaffing, simple past and past participle overstaffed)

1. (transitive) To furnish with too many staff.
   • 2009, January 18, “Jake Mooney”, in Socks and Blankets, Courtesy of a Familiar Good Samaritan‎:

     "Thankfully, we were overstaffed, both the day shift and evening shift," said Francis Englert of the Red Cross New York chapter.

• understaff