After the initial investment, the business is projected to break even within 18 months.

break 在这里是动词，意思是"打破、突破"。 even 是形容词，意思是"相等的、平衡的"。 break even 是一个固定短语，指"收支相抵、不亏不盈"，即收入与支出达到平衡的状态。