Random Japanese: 桜前線

This literally means ‘cherry blossom front’ (as in ‘front line’). It refers to the way that the cherry blossoms bloom first in the south of Japan, and then bloom in succession across the country, moving further and further north. The line of places where the cherry blossoms have bloomed on a particular day, a little like the isobars on a weather map, is the 桜前線.