1. (

• 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 ;

1. (

• trap ,
• pin ,
• immobilize ,
• immobilise

) to hold fast or prevent from moving; "The child was pinned under the fallen tree" ;

2. (

• pin ,

) attach or fasten with pins; "pin the needle to the shirt" ;

3. (

• pin ,

) pierce with a pin; "pin down the butterfly" ;

4. (

• pin

) (chess) immobilize a piece ;