Compound of 取り (tori, “taking”, the 連用形 (ren'yōkei, “continuative or stem form”) of verb 取る (toru, “to take”)) + 敢えず (aezu, related to 敢えて (aete, “daring”)).
取(と)りあえず • (toriaezu) ←とりあへず (toriafezu)?