weak in the knees

/wˈiːk ɪnðə nˈiːz/

[phrase]

weak in the knees

[PHRASE]

feeling strong emotions, like fear or anxiety, in a way that makes it difficult for one to stand

What is the origin of the idiom "weak in the knees" and when to use it?

The exact origin of the idiom "weak in the knees" is unclear, as it has been in use for a considerable period of time. However, it is thought to stem from the physical sensation that some people experience when they are overcome with strong emotions or excitement. It is commonly employed when someone experiences a strong, overwhelming, or captivating reaction to a person, event, or situation.

Examples

1. The announcement made me weak at the knees.

2. She said hello to me and I went weak in the knees.

3. Massive medical bills, spiraling credit cards, out-of-control student loans can make the strongest among us weak at the knees.

4. The shock of the announcement make me go weak at the knees.