verb
support, authorize
Synonyms: accredit, advocate, affirm, approve, attest, authenticate, back, back up, bless, boost, certify, champion, commend, confirm, countenance, defend, favor, give a boost to, give green light, give one’s word, give the go-ahead, give the nod, go along with, go to bat for, go with, guarantee, lend one’s name to, okay, praise, push, ratify, recommend, rubber-stamp, sanction, second, stand behind, stand up for, stump for, subscribe to, sustain, underwrite, uphold, vouch for, warrant, witness
Antonyms: censure, disapprove, oppose, protest, reject, repel, unauthorize
verb
countersign a check
Synonyms: add one’s name to, authenticate, autograph, cosign, notarize, put John Hancock on, put signature on, rubber-stamp, say amen to, sign, sign off on, sign on dotted line, subscribe, superscribe, undersign, underwrite