衰 means 'grow weak'

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Strokes : 10    Frequency: 1667   JLPT: N1    Usefulness: 5    Study set: 5-28    Grade: 8   Intermediate lesson: -    Beginner lesson: -   Begins 23 words   Used in 48 words   Component in 4 kanji (0 Jōyō)
Jōyō (常用)
   おとろえる to grow weak, decline
⿻   piteous   one  
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In the most useful 10,000 words in Japanese, 衰 is used 2 times, read 2 ways.
Across all words in Japanese, 衰 is used 47 times, read 2 ways.
スイ : 41 words FIND ALL
decline; degeneration; decay; waning; ebbing
(click the word to view an additional 1 form, examples and links)
おとろえる : 6 words FIND ALL
4 3
ichidan verb, intransitive verb
to become weak; to decline; to wear; to abate; to decay; to wither; to waste away
(click the word for examples and links)
An additional 哀 less common words include 衰 but the reading has not yet been categorized.
Henshall: 1456  Joy o' Kanji : 1456  Key to Kanji:

Cascading kanji view

スイ   おとろえる to grow weak, decline   
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アイ   あわ piteous, sorrowful   あわれむ to feel pity   
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コウ   ク   くち mouth   
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イ   ころも clothes   
イチ   イツ   ひと    ひと- one   
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