一葉落ちて天下の秋を知る

いちようおちててんかのあきをしる

expression

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a straw will show which way the wind blows, a falling leaf shows that autumn has come(proverb)

一	one, one radical (no.1)
葉	leaf, plane, lobe, needle, blade, spear, counter for flat things, fragment, piece
落	fall, drop, come down, village, hamlet
天	heavens, sky, imperial
下	below, down, descend, give, low, inferior
秋	autumn
知	know, wisdom