Definition of 流行り (はやり)
はや
                        流行り
はやり
hayari
noun, no-adjective
1.
fashion, fad, vogue, craze
2.
prevalence (e.g. of a disease)
Related Kanji
| 流 | current, a sink, flow, forfeit | 
| 行 | going, journey, carry out, conduct, act, line, row, bank |