twiddle your thumbs

twiddle your thumbs

be bored or idle because you have nothing to do.
See also: thumb, twiddle

ˌtwiddle your ˈthumbs

(informal) do nothing while you are waiting for something to happen: I had to sit at home twiddling my thumbs, waiting for the phone to ring.
If you twiddle your thumbs, you move them around each other while your fingers are joined together.
See also: thumb, twiddle