Translation of "abstract expressionism" into Chinese

(art) An American genre of modern art that used improvised techniques to generate highly abstract forms [..]

An American genre of modern art that used improvised techniques, such as sinuous linearity, to generate highly abstract forms while allowing the artist spontaneity. [First attested in the mid 20 ^th century.]Lesley Brown (editor), The Shorter Oxford English Dictionary, 5th edition (Oxford University Press, 2003 [1933], ISBN 978-0-19-860575-7), page 10 [..]