1 (act of) betraying, giving away 2 betrayal 3 treachery, treason 4 (act of) informing (on) 5 information, knowledge 6 (act of) having designs/intention(s) (up)on 7 (act of) making/heading for (something) with intention(s) (up)on 8 message, notification, notice (also in law) 9 (act of) taking (unfair) advantage (of) 10 (unfair) advantage