Endure a painful or otherwise unpleasant situation that is seen as unavoidable
"Biting the bullet" is a metaphor which is used to describe a situation, often a debate, where one accepts an inevitable impending hardship or hard-to-refute point, and then endures the resulting pain with fortitude. The phrase (as "bite on the bullet") was first recorded by Rudyard Kipling in his 1891 novel The Light that Failed. Wikipedia