Components
約束を守る is an exact match with one form of the following word:
約束を守る
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Reading : やくそくをまもる   
expression, 'ru' godan verb
to keep a promise; to keep one's word  (see also: 約束を破る)
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My current mastery of 約束を守る:
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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 49,108 which gives a rank of 30,410
約束を守る is the most useful form. 1 additional form is shown below.
• This form is used about 30% of the time
• Google Japan frequency rank: 172,000 (about 433,000 results)
• One of the 1240 words included in the Genki textbooks
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Example sentences:
ぎみ
くまでも
やくそく
約束
まも
らなければならない

You must stick to your promise.
約束をまもる
BOOST
Reading : やくそくをまもる   
My flashcards:
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Usefulness and usage:
• This form is used about 70% of the time
• Google Japan frequency rank: 117,000 (about 1,150,000 results)
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ヤク    promise; approximate   
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シャク   ladle
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wrap
dot   
シ   いと thread   
ソク   たば bundle   たばねる to tie in a bundle   
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コウ   ク   くち mouth   
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モク   ボク   き    こ- tree   
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ダイ   タイ   おおきい big   おおいに very much   おお-    
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イチ   イツ   ひと    ひと- one   
ジン   ニン   ひと person   
stick   
シュ   ス   まも to protect, guard   もり babysitting   
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スン   inch
roof   
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