There are several synonyms for the phrase "be spent" that can be used to convey the same meaning in different ways. For instance, "be exhausted" is a common synonym that means being completely drained of energy or resources. "Be depleted" is another synonym that implies a reduction in the amount of something, such as money or supplies. Similarly, "be consumed" conveys the same idea that something has been used up or taken in completely. Other synonyms of "be spent" include "be drained," "be used," "be worn out," and "be tapped out." Each of these options can be useful in different contexts to convey the idea of being completely depleted or used up.