Despite having long ago plighted his troth to the lunatic right, he is certainly trying.
David Freedlander reports from a Romney rally where even hitherto lukewarm fans pledged their troth.
late 12c., from a phonetic variant of Old English treowð "faithfulness, truth" (see truth). Restricted to Midlands and Northern England dialect after 16c., and to certain archaic phrases (e.g. plight one's troth). Cf. also betroth.