Related Clues:

• Not decumbent
• Set upright
• Stiff-backed
• Not slouching
• Vertical
• In a vertical position
• Like Cro-Magnon man
• Build, as a building
• Like squirrels' ears
• Like an attentive dog's ears
• Build, as a skyscraper
• Have fun with Lego blocks
• How we stand
• Standing up
• Sitting up