Definition - "An archaic term for misuse and defilement, revived in 1942 by Eric Partridge in the title Usage and Abusage: A Guide to Good English (1942). It is currently used only in his sense of improper, unidiomatic, and ungrammatical language."
(Source: Oxford Companion to the English Language s.v. abusage)

Oxford English Dictionary -
The term's first citation (in its original sense) is from 1548:
"He commaunded only ye ryght usage and not ye abusage … of ye premisses … He doth … detest ye abusers with there abusage of hys commaunded service."
(Geste Preuee Masse 133)

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