Synonyms of pop up

Noun

1. pop-up book, pop-up, book

usage: a book (usually for children) that contains one or more pages such that a three-dimensional structure rises up when a page is opened

2. pop fly, pop-fly, pop-up, fly, fly ball

usage: a short high fly ball

Verb

1. crop up, pop up, pop, appear

usage: appear suddenly or unexpectedly; "The farm popped into view as we turned the corner"; "He suddenly popped up out of nowhere"