Godan verb with 'ku' ending, Intransitive verb
to sense; to suspect; to get an inkling (of something); to get wind of; to smell (e.g. danger); to become aware of (e.g. a plot)
君といたら、彼はきっと感づくだろう。He'll be sure to smell a rat if I'm with you.
Also written 感付く【かんづく】、勘付く【かんづく】、勘づく【かんづく】