The idiomatic expression "to take the first bite" means to start or initiate something, often implying that one is taking a risk by beginning an action. It can also refer to trying out new experiences or opportunities for the first time.
Sentences with «to take the first bite»
It took a long to even take the first bite of spaghetti squash. (cookincanuck.com)
We sat down to dinner and after taking my first bite, I realized I could not taste a thing. (dulanotes.com)
Waiting until after noon every day before taking your first bite makes a low daily caloric intake a breeze. (leangainsguide.com)