Related Clues:
- Demonstrating good posture
- On an even keel
- Not sitting
- How Cro-Magnon man walked
- It can follow the last word of 20-, 27-, 47- and 53-across
- Tool-box item
- Standing upright
- Flat, as a field
- Standing at attention
- Like a soldier at attention
- Standing with proper posture
- Parking-garage division
- On two feet
- At the same height
- How we walk