a daily allowance, a daily fee
An employee can claim $120 per diem for 2 weeks towards food expenses.
per diem: define #2
Money that your employer grants you will traveling so you can drink alcohol liberally. Employer’s province this entitlement to relieve stress derived from travel, bosses, co-workers, etc.
Going out of town sucks, by at least I can drink $40 of per diem to make up for it.