English · Body & Health
thumb
/θʌm/
[/θʌm/]
short thick digit
Beginnernoun
Definition
The short, thick digit of the hand, set apart from the four fingers.
Example
She gave a cheerful thumb up to show that everything was going well.
She gave a cheerful thumb up to show that everything was going well.
Etymology
From Old English 'þūma', of Germanic origin.
How & Where It’s Used
'Rule of thumb' means a rough, practical guideline.