open wide
verb1
Idiomatic To open one's mouth wide, to gape.
- 2017, Jennifer S. Holland, For These Monkeys, It’s a Fight for Survival., National Geographic (March 2017)http://www.nationalgeographic.com/magazine/2017/03/macaques-monkeys-indonesia-endangered-pet-trade/ During my first day in the woods, Raoul, the big alpha male of Rambo II, opened wide to show me his dagger-sharp canines, then sauntered by and swatted my calf with a stick—letting me know my place in the social order. (Low.)
2
Used other than figuratively or idiomatically: see open, wide.