You'll notice in the video that I use both "on" and "at" in this idiom. You'll definitely come across both of them with idiom.

Do you want to watch more idiom lessons in National Parks? Check out the following:

Joshua Tree National Park Idiom Lessons:
- to be on edge ([ Ссылка ])
- to be on tenterhooks ([ Ссылка ])

Grand Canyon National Park Idiom Lessons:
- to be on thin ice ([ Ссылка ])
- to shoot the breeze ([ Ссылка ])
- to have the wind knocked out of you ([ Ссылка ])

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