rail spike

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

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

fixation, fixedness

to fix, to settle

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

light rail

railgun (electromagnetic gun)