[beset]

In the 1980s and 1990s, chill gained currency as a slang term meaning "to relax, calm down." It is first recorded in 1979 and comes from Black English slang, which has frequently been a source of slang and informal words in Standard English, often through the medium of various African-American musical styles (in this case, rap and hip-hop). In fact, the word chill has had several incarnations as a slang term both inside and outside Black English. An older slang sense, recorded first in the 1870s, has been "to lose interest (in something), sour (on something)." Since the late 1920s it has also been used transitively to mean "to quash" and even "to kill." The recent use in the sense "to calm down" is another example of slang's innovativeness: English has always used words referring to heat and cold metaphorically to refer to emotions, and has used cool to refer to calmness since Old English times. Chill is a novel way of saying cool down, an old metaphor. The semantic evolution of chill continues as this is being written; the new sense of "to relax" has even more recently been extended to mean "to relax among friends, socialize." Chill thus offers a good example of how living languages are constantly changing in ways that are at once unpredictable and immediately comprehensible. (from on living languages)