go weak in the knees

go weak in the knees

To become unsteady or flustered due to having a strong emotional reaction to someone or something. Hearing the news of my father's sudden death, I went weak in the knees and could barely remain standing. Just thinking about Samantha makes me go weak in the knees.
See also: knee, weak
References in periodicals archive ?
Most pizza aficionados will love the Vegan Notzzarella or the Vegan Notzzarella Uncheddar options, and veggie lovers will go weak in the knees for the Vegan Spinach Chumus or Vegan Veggie Chumus.
I know thousands of females who go weak in the knees just by hearing Eminem's name (Letters, 12/11/00).