off the books, undisclosed, hidden, unrecorded

To perform; to do; to conduct oneself; to carry out.

detection, disclosure, exposure, revelation

to detect, to expose

register, record book

trade, have dealings with

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

外, 他: other, the rest