1 the short thick finger at the side of the hand, slightly apart from the other fourShe still sucks her thumb when she's worried. see also green thumb2 the part of a glove that covers the thumbThere's a hole in the thumb.Idioms
be all (fingers and) thumbs
to be awkward with your hands so that you drop things or are unable to do something
hold thumbs
(South African English) to hope that your plans will be successful or that something will take place in the way that you want it toLet's hold thumbs that you get the job.thumbs up/down
(informal) used to show that something has been accepted/rejected or that it is/is not a successTheir proposals were given the thumbs down.It looks like it's thumbs up for their latest album. In contests in ancient Rome the public put their thumbs up if they wanted a gladiator to live, and down if they wanted him to be killed.under somebody's thumb
(of a person) completely controlled by somebodyShe's got him under her thumb. more at a rule of thumb at rule noun, stand/stick out like a sore thumb at sore adjective, twiddle your thumbs at twiddle verb
θʌm 
θʌm 