(Britain) A man with the job of collecting refuse from people's homes and transporting it to a refuse tip for processing.

(computing) A helpfile in Unix and Unix-like operating systems.

A man with extraordinarily broad and comprehensive knowledge.

(historical) Hesperopithecus haroldcookii, a putative species of ape, heralded as the first higher primate of North America, but later found to have been classified incorrectly.

(American football) A single player on offense (always a backfielder) who is moving backwards or parallel to the line of scrimmage at the snap.

People have differing tastes; what pleases one person may displease another.

Some people's misfortune is other people's fortune.

(uncommon) Alternative form of one man's meat is another man's poison.

(uncommon, humorous) Alternative form of one man's meat is another man's poison.

What is useless to one person is valuable to another.