backsword

know well, be familiar with, be well informed about

thorough knowledge of

sword / Suit of swords

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

back / a backer, a supporter (someone who supports a person or enterprise) / reversing, moving backwards

(sex); go back / move backwards / give a refund

back / reverse / rear / support / background