noun
plural thumbs
[count] the short, thick finger on the side of your hand
the part of a glove or mitten that covers a thumb
all thumbs
US or Brit all fingers and thumbs
extremely awkward or clumsy
rule of thumb
stick out like a sore thumb
twiddle your thumbs
under someone's thumb
under someone's control or influence
verb
thumbs; thumbed; thumbing
informal :to ask for or get a ride in a passing vehicle by sticking out your arm with your thumb up as you stand on the side of the road :hitchhike [+ obj]
thumb through
[phrasal verb]
thumb through (something) :to turn the pages of (a book, magazine, etc.) quickly
thumb your nose at
to show very clearly that you do not like or care about (something)
US