"On-trend" is a term that refers to something that is currently fashionable or popular. Synonyms for this phrase could include "in-vogue," "in-style," "stylish," "popular," "trendy," "fashionable," "chic," "contemporary," and "modern." Other synonyms for "on-trend" could relate to specific industries or fields, such as "cutting-edge" for technology or "avant-garde" for fashion. Whatever the context may be, using synonyms for "on-trend" can provide a broader range of descriptive language and help to convey a more precise meaning.