Nail up Definition 1 of 2Pro Tip 1/3Physical Action Emphasizes the physical effort of lifting and attaching with nails. We had to nail up the sign after the wind knocked it down. Pro Tip 2/3Lasting Fix Suggests a permanent or long-term solution to prevent something from moving. Make sure to nail up the frame securely so it won't fall. Pro Tip 3/3Visible Work Indicates that the results of nailing are often seen by others. She decided to nail up her art pieces around the café.