n. One who adapts his opinions and manners to the times; one who obsequiously compiles with the ruling power; -- now used only in a bad sense. [ 1913 Webster ]
[うちまたこうやく;うちまたごうやく, uchimatakouyaku ; uchimatagouyaku] (n) double-dealer; fence-sitter; timeserver; moving back and forth between two sides in a conflict; duplicity; turncoat