Meals provided to staff (especially in restaurants) — 'makanai'. It can also refer more broadly to provisioning or covering expenses.
この店の賄いは毎日従業員に出される。
This shop provides meals to its staff every day.
今日は賄いがあるから、お弁当を持ってこなくていいよ。
There's staff meal today, so you don't need to bring a lunchbox.
賄い担当の新人が料理を作ってくれた。
The new person in charge of staff meals cooked for us.