a heavy rain that occurs around the fifth lunar month; an early summer rain / (figuratively) that which repeats over and over without lasting long

a Shiratsuyu-class destroyer of the Imperial Japanese Navy during World War II (see Japanese destroyer Samidare (1935) on Wikipedia.Wikipedia) / a place name

a heavy rain that occurs around the fifth lunar month; an early summer rain.

at that time; in those days

such a time / time of year, season

pile up, accumulate / bulk, volume

bulk, large quantity / mass, volume

五月雨: heavy rain occurring around the fifth lunar month; an early summer rain; that which repeats over and over without lasting long

五月雨: a place name

rapids, current