Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending
to use someone's (argument, attack) against them; to use (an attack) to one's advantage; to take advantage of (a negative situation)
彼はうまくそのトラブルを逆手に取った。He skillfully turned the trouble to his advantage.
Also written 逆手にとる【さかてにとる】