Components
くすぶる is an exact match with one form of the following word:
くすぶる
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'ru' godan verb, intransitive verb
1. to smoke; to smoulder; to smolder; to sputter  (often written with kana only)
2. to be sooty; to be smoke-stained  (often written with kana only; this meaning is restricted to reading くすぶる, ふすぶる)
3. to smoulder (e.g. a dispute); to smolder  (often written with kana only; this meaning is restricted to reading くすぶる)
4. to seclude oneself  (often written with kana only; this meaning is restricted to reading くすぶる, ふすぶる)
5. to live in obscurity; to stay in the same level (of social position, circumstances, etc.)  (often written with kana only; this meaning is restricted to reading くすぶる)
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My current mastery of くすぶる:
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Usefulness and usage:
Kanshudo usefulness level: 9 (among the 50,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 47,526 which gives a rank of 29,155
くすぶる is the most useful form. 2 additional forms are shown below.
• This form is used about 70% of the time
• Google Japan frequency rank: 133,000 (about 690,000 results)
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Example sentences:
くすぶっていた
たきぎ
とつぜん
突然
がった

The smoldering firewood burst into flame.
燻ぶる
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Readings : くすぶる    ふすぶる   
燻ぶる can be read in 2 ways: くすぶる (almost always used), ふすぶる (rare).
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 219,000 (about 134,000 results)
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燻る
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Readings : くすぶる    ふすぶる    いぶる   
燻る can be read in 3 ways: くすぶる (50%), いぶる (30%), ふすぶる (20%).
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 221,000 (about 122,000 results)
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くすぶる to smolder, smoke   
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カ   fire   ひ    ほ-    
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eight
ジン   ニン   ひと person   
クン   いぶ to smoke (meat, fish)   
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セン   1000; thousand   ち 1000   
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katakana 'no'; whereupon; splitting away from
ジュウ   ジッ   と    とお ten   
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イチ   イツ   ひと    ひと- one   
stick   
コク   くろい black   
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