look daggers at someone
look daggers at (one)
To glare at someone very angrily, spitefully, or disdainfully. I noticed the bride looking daggers at the best man as he started making vulgar jokes during his speech.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
look daggers at someoneLITERARY
If someone looks daggers at you, they stare at you in a very angry way. Christabel stopped combing her hair and looked daggers at Ron. Note: Verbs such as stare and shoot are sometimes used instead of look. Mr. Trancas was grinning, while the other man stared daggers at him. Dede shot daggers at her adversary until she was out of sight.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012