Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ex-prōmitto, mīsi, 3, v. a., in mercant. lang., to promise or agree to pay for one’s self or for another (not in Cic.): nummos, Varr. R. R. 2, 2, 5: pecuniam alicui, Dig. 23, 3, 36; 16, 1, 22.