Related Clues:

• Snap a snap on, say
• Connect, as a seat belt
• Adjust, as one's laces
• Fix, as a bowline
• Fix securely
• Fix, tie
• Fix firmly or join together
• Tie, secure
• Close, secure
• Tie or join together, fix firmly
• Fix to, secure
• Close, make secure
• Speed up enough to make one tight?
• Get a grip on this to accelerate it, perhaps
• Might this speed it up and make it stick?