"fastens" in the verb sense
1. fasten, fix, secure
cause to be firmly attached
"fasten the lock onto the door"
"she fixed her gaze on the man"
2. fasten
become fixed or fastened
"This dress fastens in the back"
3. fasten
attach to
"They fastened various nicknames to each other"
4. tighten, fasten
make tight or tighter
"Tighten the wire"
Source: WordNet® (An amazing lexical database of English)
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