“Dark as the devil’s riding boots” nghĩa là gì?

“Dark as the devil’s riding boots” = như ủng của quỷ -> nghĩa là tối mù mịt.

Ví dụ

That way, when it's dark as the devil’s riding boots, my phone's in dark mode; when it's light out, my phone is in light mode.

It's dark as the devil’s riding boots, so you can only search for them in areas where the streetlight is illuminating the ground.

There might get upset when they arrive home from work Friday, and it's dark as the devil’s riding boots outside, and there's a strange car parked in their driveway.

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