Definition of overstaff in US English:

overstaff

verb

[with object]usually as adjective overstaffed
  • Supply with surplus staff.

    ‘government departments are overstaffed’
    ‘an overstaffed public sector’
    ‘believing it would continue to grow, they had overstaffed the company’

Pronunciation

overstaff

/oʊvərˈstæf//ōvərˈstaf/