Grammar. 1  Also called objective case. (in English and some other languages) a case specialized for the use of a form as the object of a transitive verb or of a preposition, as him in The boy hit him, or me in He comes to me with his troubles. 2  a word in that case.
pinning-a mutual promise of a couple not to date anyone else; on college campuses it was once signaled by the giving of a fraternity pin. promise-a verbal commitment by one person to another agreeing to do (or not to do) something in the future.
a small, slender, pointed piece of metal, etc., used as a fastener or support. any of many different forms of fasteners, badges, or ornaments made up in part of a penetrating piece, wire, or shaft:a fraternity pin;a tiepin;a diamond pin on her dress.