(slang, especially Canada, US) Cannabis.

(filmmaking) A standard wooden clothespin with a metal spring, used to hold gels to the barn doors of cinema lights.

The decade of the 1940s. / Temperatures from 40 to 49 degrees.

plural of 40 (“bottle of beer”)

(US Army and Marines, military, slang) Any weapon firing a 40mm grenade. Often specifically the M203 grenade launcher, mounted underneath an M-16 or variant. In the Marine Corps, often the Mark-19 Automatic 40mm Grenade Launcher.

Someone who carries out a Nigerian scam.

The geographic region between 10 degrees north and 40 degrees north latitude, especially when considered as a target for Christian missionary work.

(Palestine, Israel, slang) An Arab resident of Israel.

(US politics, slang) Joe Biden, as the forty-sixth president of the United States.

plural of 470