simple past tense and past participle of coosin

(paper) Abbreviation of duodecimo, a page size (5-5.5 x 7.125-7.5) / (printing) A book size using duodecimo-sized pages.

(rare) Capable or able to be flummoxed.

(medicine, informal) Initialism of brought in by. / (business) Abbreviation of business is business.