When we use the phrase "sticks in there," we often mean that someone is persistent and resilient in the face of challenges or difficulties. There are many synonyms that can convey this same meaning, such as perseveres, persists, endures, and tenaciously holds on. Other related terms might include steadfast, unwavering, and resolute. When we describe someone as sticking in there, we may also be referring to their ability to stay focused on a particular goal or objective, demonstrating qualities such as determination, dedication, and grit. Whatever words we use to convey this idea, the important thing is that we recognize and celebrate those who refuse to give up in the face of adversity.