Bite the Bullet(endure in a difficult situation)
We really had a frightening experience when we went hunting last month.
What happened?
We got lost in the wilderness and had to bite the bullet until help arrived.
Did you manage OK?
Barely. We weren't prepared for the cold weather and we couldn't find any shelter. We had to endure in a very trying situation. We almost froze by the time they found us.
trying = つらい、苦しい cf.「人を試練に合わせる」/ trial｢試練:苦難｣