How we use number four in a phrase?

The Four Freedoms are the four basic human freedoms identified by U.S. President Franklin D. Roosevelt in his State of the Union message in January of 1941. They are the freedom of speech, the freedom of religion, the freedom from want, and the freedom from fear of physical aggression. In August of 1941, Roosevelt and Winston Churchill included the Four Freedoms in the Atlantic Charter, which advocated the restoration of self-government to peoples forcibly deprived of it.

“A four-letter word” is literally a word with four letters, such as “word”. The term “four-letter-word” also indicates obscene words. This use goes back to the 19th Century.

 

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