Components
更かす is an exact match with the following word:
更かす
BOOST
Reading : ふかす   
'su' godan verb, transitive verb
to sit up late
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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 76,962 which gives a rank of 10,708
• Google Japan frequency rank: 252,000 (about 7,500 results)
• This form is used as an example of an official Joyo kanji reading
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Example sentences:
かれ
よる
かし
するようなった
He fell into the habit of keeping late hours.
かれ
ども
よる
かし
する
こと
ゆる
しません

He will not permit his children to sit up late.
おい
よる
かし
なれていた
My nephew was accustomed to sitting up late.
コウ   さら again   ふける grow late   ふかす stay up late   
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イチ   イツ   ひと    ひと- one   
ニチ   ジツ   sun; day   ひ    -か    
crossed swords
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