a pair of hands

Từ điển Oxford Advanced Learner 8th

a pair of ˈhands idiom
(informal)a person who can do, or is doing, a job
•We need an extra pair of hands if we're going to finish on time.
•Colleagues regard him as a safe pair of hands (= sb who can be relied on to do a job well).
Main entry: ↑pair_idiom