Related Clues:

• Attach firmly
• Make secure
• Shut
• Snap together
• Hook up, as a seat belt
• Attach, perhaps with hardware that begins the answers to starred clues
• "___ your seatbelts"
• Buckle or button
• Snap a snap on, say
• Connect, as a seat belt
• Fix securely
• Fix, tie
• Fix firmly or join together
• Tie, secure
• Close, secure