slay (them) with (someone's) look

Translations
убить (их) взглядом
She could slay them with her look of disdain.
Она могла убить их взглядом презрения.
Definitions
To impress, captivate, or overwhelm others with someone's appearance, style, or fashion sense; often used to describe someone looking exceptionally attractive or stylish, to the point that it figuratively 'defeats' or 'slays' those who see them.