thumb down

1. To get (a passing vehicle) to stop and give one a ride, signalling to the driver by holding out one's thumb (as a hitchhiker).

   I was stranded in the middle of nowhere, but luckily I managed to thumb down a passing car.

2. To disapprove or reject.

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• thumb downTo get (a passing vehicle) to stop and give one a ride, signalling to the driver by holding out one's thumb (as a hitchhiker).
• thumb throughTo use one's thumb to quickly flip through the pages of a book, magazine, etc., especially without reading them thoroughly or at all.