un ‧ der ‧ pay /ˌʌndəˈpeɪ $ -ər-/ BrE AmE verb ( past tense and past participle underpaid ) [transitive]
[ Word Family: noun : ↑ pay , ↑ payment , ↑ repayment , ↑ payer , ↑ payee ; verb : ↑ pay , ↑ repay , ↑ underpay ≠ ↑ overpay ; adjective : paid ≠ ↑ unpaid , ↑ underpaid ≠ ↑ overpaid , ↑ payable ]
to pay someone too little for their work