From Longman Dictionary of Contemporary Englishlook daggers at somebodylook daggers at somebodyinformalLOOK AT to look at someone angrily → dagger
Examples from the Corpus
look daggers at somebody• The lady behind the counter looked daggers at me.• Their relationship is not free and easy but at least Red is no longer looking daggers at her.look daggers at somebodylook daggers at somebodyinformalEXPRESSION ON somebody'S FACE to look at someone with a very angry expression on your face → lookExamples from the Corpus
look daggers at somebody• Their relationship is not free and easy but at least Red is no longer looking daggers at her. 