Related Clues:

• Meshing parts
• Car-transmission settings
• Backpack contents
• First, second, etc.
• Bicycle parts
• In high --
• They often get engaged
• Tenspeed features
• Clock part, perhaps
• Backpack stuff
• Bat, ball, glove, etc.
• Reverse or drive
• Neutral, e.g.
• Drive or second
• Four-on-the-floor options