(horticulture) A hotbed made of spent bark.

(idiomatic, especially military, of a fighting person, unit, or vehicle) To make one's opponent pay a very high price to defeat or obtain (a person, unit, vehicle, or territory).

(uncountable) The specific conservative ideology associated with the Reagan administration, 1981-1989. / (countable) A statement or position commonly associated with Ronald Reagan.

(mineralogy) A variety of apatite containing chloride instead of fluoride.