thumb

US /θʌm/
UK /θʌm/
"thumb" picture
1.

the short, thick first digit of the human hand, set apart from the other four and opposable to them.

:
He gave a thumbs-up to show approval.
She hurt her thumb while playing basketball.
1.

to turn over pages with the thumb

:
He thumbed through the book, looking for a specific passage.
She quickly thumbed through the dictionary.
2.

to hitchhike

:
They decided to thumb their way across the country.
It's dangerous to thumb a ride on this highway.