open wide

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open wide (third-person singular simple present opens wide, present participle opening wide, simple past and past participle opened wide)

1. Used other than figuratively or idiomatically: see open,‎ wide.
2. (idiomatic, intransitive) 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)

     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.)

• wide open