Related Clues:

• Dentist's word
• Unclose
• Store door word
• Unfolded
• Word on a store sign that's flipped daily
• Patent
• Lincoln is the only U.S. president to have one
• Accepting customers
• Ajar, e.g.
• Accessible to all
• As yet undecided
• Unlatch
• Unobstructed
• U.S. ___
• Not secret or hidden