ap-prōmitto (adp-), ĕre, v. a.,
to promise in addition to , i. e. also in one's own name : cumque id ita futurum T. Roscius Capito appromitteret, Cic. Rosc. Am. 9, 26.
apprōmittō (ad-p-) —, —, ere, to promise besides, join in a promise. ...
An Elementary Latin Dictionary