1. A book (usually for children) that contains one or more pages such that a three-dimensional structure rises up when a page is opened
   - pop-up book 
2. A short high fly ball
   - pop fly, pop-fly

1. Appear suddenly or unexpectedly
   "He suddenly popped up out of nowhere"
   - crop up, pop

Derived forms: popped up, popping up, pops up, pop-ups

Type of: appear, book, fly, fly ball

Encyclopedia: Pop up

• catling
• catmint
• catnap
• catnip
• Catocala nupta
• catoptric
• catoptrical
• catoptrics
• Catoptrophorus
• Catoptrophorus semipalmatus
• catostomid
• Catostomidae
• Catostomus
• catseye
• Catskill Mountains
• Catskills
• catsup
• catsup bottle
• cattail
• cattail family
• cattail millet
• cattalo
• Cattell
• cattery
• cattie