Daggers is simply the plural of 'dagger,' a short, pointed knife used as a weapon. But you'll most often meet this word in two idioms. 'To look daggers at someone' means to give them an extremely angry, hateful look, as if your eyes could stab them. 'At daggers drawn' describes two people or groups who are in open, serious conflict with each other.

匕首(複數); look daggers at sb = 怒目而視、狠瞪(某人); at daggers drawn = 勢不兩立、劍拔弩張