A pair of dies is dice! But then what does 'pair of dice' mean? Which brings us to another problem: I can buy a new pair of pants - or even 'some new pants' -

A pair of dies is dice! But then what does 'pair of dice' mean? Which brings us to another problem: I can buy a new pair of pants - or even 'some new pants' - but I've never seen 'a pant' for sale !! ;-)