From Longman Dictionary of Contemporary Englishtwiddle your thumbstwiddle your thumbsinformal to do nothing while you are waiting for something to happen Let’s go – there’s no point in sitting here twiddling our thumbs. → twiddle
Examples from the Corpus
twiddle your thumbs• I sat there and twiddled my thumbs.• The rest of us could just sit and twiddle our thumbs and drink iced coffee.• Till then, its quarry sat twiddling his thumbs and not quite smirking. 