Components
し合う is an exact match with one form of the following word:
しあう
BOOST
'u' godan verb, transitive verb
to do together  (see also: 為る:する; often written with kana only)
My mastery:
My current mastery of しあう:
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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 74,186 which gives a rank of 10,682
しあう is the most useful form. 2 additional forms are shown below.
• This form is used about 60% of the time
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Example sentences:
テレビ
しんぶん
新聞
たが
きのう
機能
ほかん
補完
しあっている
Television and newspapers play complementary roles.
こんど
今度
きょうてい
協定
しゃ
しょうにん
承認
った

This agreement was confirmed by three companies.
わたし
かれ
ほうもん
訪問
あいだ
がら
です
I am on visiting terms with him.
し合う
BOOST
Reading : しあう   
My flashcards:
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Usefulness and usage:
• This form is used about 30% of the time
• Google Japan frequency rank: 70,000 (about 4,560,000 results)
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為合う
BOOST
Reading : しあう   
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 17,000 (about 40,400,000 results)
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ゴウ   ガッ   カッ   あ to fit, come together   あわす to match   あわせる to unite, join   
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assembly, gathering   
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イチ   イツ   ひと    ひと- one   
ジン   ニン   ひと person   
コウ   ク   くち mouth   
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イ    do   
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fire
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