confirm

[1]	ratify , corroborate , sustain , sanction , authorize , substantiate , support , endorse , support , affirm , sustain , approve , uphold , back up , validate , verify , recognize , authenticate , accredit
[2]	establish , reassert , settle , affirm , ensure , clinch , substantiate , guarantee , bind , seal
[3]	strengthen , encourage , fortify , reinforce , corroborate , substantiate , buttress , prove