に就て[nitsuite] concerning
に就き[nitsuki] because of
去就[kyoshuu] committing one's self
就いては[tsuiteha] in line with this
就きましては[tsukimashiteha] in line with this

就く[tsuku] to ascend (the throne)
就ける[tsukeru] to install (a king, emperor, etc.)
就学[shuugaku] entering school
就学義務[shuugakugimu] compulsory school attendance
就学児童[shuugakujidou] school child

一進一退[isshinittai] now advancing and now retreating
引退[intai] retire
隠退[intai] retirement
隠退生活[intaiseikatsu] secluded life
遠退く[toonoku] to become distant

遠退ける[toonokeru] to keep (someone) at a distance
押し退ける[oshinokeru] to push aside
撃退[gekitai] repulse
減退[gentai] decline
後退[koutai] retreat