Components
投下 is an exact match with one form of the following word:
投下
BOOST
Reading : とうか   
1. throwing down; dropping; airdrop
2. investment
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My current mastery of 投下:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 5 (among the 10,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 96,238 which gives a rank of 6,720
投下 is the most useful form. 1 additional form is shown below.
This word is a member of our collection of the 10,000 most useful words in Japanese:
• This form is used about 80% of the time
• Google Japan frequency rank: 37,000 (about 14,700,000 results)
• Wikipedia most common 20000 words rank: 8248
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 12 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
• This form is used as an example of an official Joyo kanji reading
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Example sentences:
1945
ねん
ひろしま
広島
げんし
原子
ばくだん
爆弾
とうか
投下
された

An atomic bomb was dropped on Hiroshima in 1945.
その
せんとうき
戦闘機
ばくだん
爆弾
とうか
投下
した

The fighter plane released its bombs.
とうか
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 20% of the time
• Google Japan frequency rank: 72,000 (about 4,360,000 results)
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 12 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
VIEW INFLECTIONS
トウ   なげる to throw (something)   
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lance shaft   
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キ    table   
また again   
hand
カ   ゲ   した below, under   しも bottom part   もと under (influence)   さげる to lower, to reduce   さがる to be lowered   くだ to descend   くだ to judge   くださる to give   おろす to drop off (passenger)   おりる to get off (train)   
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Search results include information from a variety of sources, including Kanshudo (kanji mnemonics, kanji readings, kanji components, vocab and name frequency data, grammar points, examples), JMdict (vocabulary), Tatoeba (examples), Enamdict (names), KanjiVG (kanji animations and stroke order), and Joy o' Kanji (kanji and radical synopses). Translations provided by Google's Neural Machine Translation engine. For more information see credits.
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