The Collaborative International Dictionary of English v.0.48:
Unbraid \Un*braid"\, v. t. [1st pref. un- + braid.] To separate the strands of; to undo, as a braid; to unravel; to disentangle. [1913 Webster]WordNet (r) 3.0 (2006):
unbraid v 1: undo the braids of; "unbraid my hair" [ant: braid, pleach]