How common is common?
An analysis of a 1.9 billion-word corpora gives an indication of frequency of usage of a particular idiom. This index number can be found on each idiom page (about half way down the page) and looks like this ...
A page opens with the idiom that you are studying highlighted in yellow.
Scroll up and down to see how popular the idiom is in relation to other idioms.
Is the particular idiom in question popular in the U.S.? Is it more popular in Great Britain?
(Click on (tap) the number on the right)
A page opens which allows you to compare the popularity of the idiom in different countries.
Use of individual English idioms varies from culture to culture and geographically.