引去る[hikisaru] to retreat
汚染除去[osenjokyo] decontamination
去なす[inasu] to parry
過ぎ去った可能性[sugisattakanousei] might-have-been
過去る[sugisaru] to pass

過去[kako] the past
過去形[kakokei] past tense
去る[saru] to leave
去月[kyogetsu] last month
去就[kyoshuu] committing one's self