2. forming verbs , it was generalized from certain verbs of French origin
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
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Wortherkunft von '-ish'(sense 1) ME < OE -isc, akin to Ger -isch, L -iscus, Gr -iskos; (sense 2) ME -ishen, -ischen, -issen < OFr -iss-, -is-, stem element in pres. tense < L -isc-, in inceptive verbs