thumb · n
a rule of thumb
C1 a way of judging something that is not exact but which will help you to be correct enough
Dictionary examples:
As a rule of thumb, you need one egg for every 125g flour. (38.4)
thumb
B1 the short thick finger on the side of your hand which makes it possible to hold and pick things up easily
Dictionary examples:
My thumbs are so short, I can't reach the spacebar on my phone! (0.0)
My thumbs got tired from too much texting, so I used my nose instead! (0.0)
I lost a thumb-wrestling match to my grandma. She's really strong! (0.0)
She still sucks her thumb. (53.8)