- FASTEN
- Tie up
- Button up
- Secure
- Lock into place
- Attach
- Connect, as a 31-Across
- Snap or staple
- Buckle up
- Click together
- Join together
- Attach securely
- Connect
- Attach firmly
- Staple, say
- __ your seatbelts
- Hook up, as a seat belt
- Snap together
- Attach, perhaps with hardware that begins the answers to starred clues
- Fix
- Get together
- Nail or tack
- Buckle or button
- Make secure, as a seat belt
- Connect, as a seat belt
- Buckle up, as a seat belt
- Buckle
- Lock.
- Affix.
- Cement.
- Fix firmly.
- Join.
- Tether.
- Tie.
- Use a clasp
- Hitch
- Tie or clasp
- Snap a snap on, say
- Close, as seatbelts
- ___ your seatbelts
- Attach, as seat belts
- Connect, as a child's safety seat
- Tie down, say
- Button up, e.g.
- Pin, tie or glue
- ___ your seat belt
- Put the screws to?
- Belt or bolt
