underpayun‧der‧pay /ˌʌndəˈpeɪ $ -ər-/ 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, payableto pay someone too little for their work