Phrase(s): nail something up
1. to put something up, as on a wall, by nailing. • Please nail this up. • I’ll nail up this picture for you. 2. to nail something closed; to use nails to secure something from intruders. • Sam nailed the door up so no one could use it. • Who nailed up the door? I can’t get in!
McGrawhill's American Idioms And Phrasal Verbs