The phrase "be in vogue" means to be currently popular or fashionable. There are several synonyms for this phrase, including "be in style," "be in fashion," "be trendy," "be hip," and "be in demand." These phrases all convey the idea that something is currently being appreciated by a large number of people and is considered fashionable and desirable. Other related phrases might include "be all the rage," "be the latest craze," and "be in the limelight." Whatever the specific phrase used, the idea is the same: something is currently having a moment of widespread popularity and cultural relevance.