rail (railroad track, train track) / rail, track (guide for a curtain or door) / early preparations for the smooth progress of something

to use / to employ / to make use of, to apply / to spend

悪戯: tease, prank, trick, practical joke, mischief

奥義, 奥儀: the heart or depth of something; the inner secrets of something

釘: nail

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

to fix, to settle

fixation, fixedness