The Collaborative International Dictionary of English v.0.48:
obliger \o*bli"ger\ ([-o]*bl[imac]"j[~e]r), n. One who, or that which, obliges. --Sir H. Wotton. [1913 Webster]WordNet (r) 3.0 (2006):
obliger n 1: someone who performs a service or does a favor [syn: obliger, accommodator]