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

臥薪嘗胆[gashinshoutan] going through thick and thin to attain one's objective
魂胆[kontan] soul
大胆[daitan] bold
胆汁[tanjuu] bile
胆石[tanseki] gallstones

胆のう[tannou] gall bladder
胆力[tanryoku] courage
度胆を抜く[dogimowonuku] to knock or scare (someone) out of his or her wits
落胆[rakutan] discouragement