Components
落とす is an exact match with one form of the following word:
落とす
BOOST
Reading : おとす   
'su' godan verb, transitive verb
1. to drop; to lose; to let fall; to shed (light); to cast (one's gaze); to pour in (liquid); to leave behind
2. to clean off (dirt, makeup, paint, etc.); to remove (e.g. stains or facial hair); to lose; to spend money at a certain place; to omit; to leave out; to secretly let escape
3. to lose (a match); to reject (an applicant); to fail (a course); to defeat (in an election)
4. to lower (e.g. shoulders or voice); to lessen (e.g. production or body weight); to worsen (quality); to reduce (e.g. rank or popularity); to speak badly of; to make light of; to fall into straitened circumstances
5. to fall into (e.g. a dilemma or sin); to make one's own; to have one's bid accepted
6. to make someone (fall in love); to force surrender; to take (e.g. an enemy camp or castle); to forcefully convince; to press for a confession; to deal with  (esp. オトす)
7. to download; to copy from a computer to another medium  (computer terminology)
8. to make someone swoon (judo)  (martial arts term)
9. to finish a story (e.g. with the punch line)
10. to finish (a period, e.g. of fasting)
落とす is the official form, but 落す is not considered incorrect, and is commonly encountered. For more information see https://japanese.stackexchange.com/questions/36568/whats-the-difference-between-落す-and-落とす ⇗.
My mastery:
My current mastery of 落とす:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 1 (among the 500 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 168,910 which gives a rank of 417
落とす is the most useful form. 3 additional forms are shown below.
This word is a member of our collection of the 10,000 most useful words in Japanese:
• This form is used about 60% of the time
• Google Japan frequency rank: 21,000 (about 30,300,000 results)
• This form appears in Wikipedia's list of JLPT N1 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 859 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 2720
• One of the 1240 words included in the Genki textbooks
• 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 17 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:
わたし
ぎょう
としていた

I have left out one line in reading.
マユコボール
としてしまった

Mayuko has dropped the ball.
きょうふう
強風
から
とした

Strong winds stripped the tree of its leaves.
Useful expressions:
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落す
BOOST
Reading : おとす   
My flashcards:
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Usefulness and usage:
• This form is used about 40% of the time
• Google Japan frequency rank: 29,000 (about 20,100,000 results)
• This form appears in Wikipedia's list of JLPT N4 vocabulary (see JLPT collections)
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おとす
BOOST
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 128,000 (about 851,000 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 17 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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オトす
BOOST
Reading : おとす   
My flashcards:
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Usefulness and usage:
• This form is rarely used
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ラク   おちる to fall   おとす to drop (something)   
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grass   
ラク    Kyoto; the capital   
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スイ   みず water   
カク   each; every   おのおの each   
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コウ   ク   くち mouth   
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go
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