The phrase "bear down on it" is commonly used to describe a situation where one needs to focus and work hard to achieve something. Synonyms for this phrase include "power through," "persevere," "push forward," "drive on," and "soldier on." These words all convey the idea of digging in and mustering strength and determination to overcome obstacles. Other phrases that can be used to convey a similar meaning include "grind it out," "put your nose to the grindstone," and "dig deep." Regardless of the specific words used, the idea is to stay focused and determined in the face of adversity and to never give up.