Nail Sth Meaning Attach Vertical Surface Wall Door

Meaning: If you nail something up, you use a nail to attach it to a vertical surface like a wall or a door.

• nail up sth Emilio nailed up a horseshoe over the front door of our house. He says it'll bring us good luck.
  
  
• nail sth up Could you get a hammer and nail the picture up in the bedroom?