Related Clues:

• 9 across begins on the stairs
• Armstrong's "small" stride
• 'That's one small -- ...'
• Progress measure
• Unit in a plan
• Move a foot?
• Part of assembly instructions
• Aerobics class type
• Fred Astaire move
• Accelerate, with ''up''
• 'Watch your ___!'
• See 20
• See 16
• One of 39 keeps dancing on ladder
• See 8