Components
急変 is an exact match with one form of the following word:
急変
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Reading : きゅうへん   
1. sudden turn; sudden change
2. (suddenly occurring) accident; emergency
My mastery:
My current mastery of 急変:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 6 (among the 15,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 68,712 which gives a rank of 12,461
急変 is the most useful form. 1 additional form is shown below.
• This form is used about 90% of the time
• Google Japan frequency rank: 78,000 (about 3,620,000 results)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 26 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
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Example sentences:
サイレン
きゅうへん
急変
らせました

The siren sounded an emergency.
かれ
びょうじょう
病状
きゅうへん
急変
する
だれ
おも
っていなかった

Nobody expected that his condition would take a sudden turn.
じたい
事態
きゅうへん
急変
した

There was a sudden change in the situation.
きゅうへん
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 166,000 (about 462,000 results)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 26 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
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キュウ   いそ to hurry   
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シン   こころ heart   
corner
yo = to yell / say hi
ヘン   unusual   かえる to alter, change   かわる to change   
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go
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また again; also   
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イチ   イツ   ひと    ひと- one   
セキ   シャク   あか    あか red   あからむ to turn red   あからめる to blush   
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