"pinning" in the noun sense
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
"pinning" in the verb sense
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
Source: WordNet® (An amazing lexical database of English)
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