endorses

advocate affirm approve back commend confirm defend favor okay praise ratify recommend sanction uphold

accredit attest authenticate bless boost certify champion countenance guarantee push second sustain underwrite warrant witness

back up 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 lend one's name to rubber-stamp stand behind stand up for stump for subscribe to vouch for

attack censure criticize deny disagree disapprove discourage dissuade invalidate oppose refuse reject renounce veto

halt

protest repel unauthorize

sign

authenticate autograph cosign notarize subscribe superscribe undersign underwrite

add one's name to put John Hancock on put signature on rubber-stamp say amen to sign off on sign on dotted line

censure disapprove oppose protest reject repel unauthorize