When something becomes narrow, it means it is being constricted or squeezed together, resulting in a reduction of width or size. There are several synonyms for this term, including become tight, narrow down, constrict, shrink, and compress. These words imply the same idea of reduction in size or space. However, each term may vary in intensity and application. For instance, "become tight" suggests a gradual increase in pressure, while "compress" denotes a more forceful action. Nonetheless, whatever synonym you choose to use for the phrase "become narrow," the underlying meaning remains the same - that something is becoming constrained or limited.