Related Clues:

• Reason to say "1, 2, 3..."
• Run up the flagpole, e.g.
• Travel unit
• Hurdle of sorts
• A moon of Saturn
• Midterm event
• Do lab work
• Encyclopedia illustration
• Book with a key
• Take acid
• Tourist's need
• Two-dimensional world?
• One way to start the fall?
• Go sprawling
• Gas station purchase