Components
空く is an exact match with one form of the following word:
空く
BOOST
Reading : すく   
'ku' godan verb, intransitive verb
1. to become less crowded; to thin out; to get empty
2. to be hungry  (see also: お腹が空く)
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My current mastery of 空く:
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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 98,667 which gives a rank of 5,183
空く 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 30% of the time
• Google Japan frequency rank: 80,000 (about 3,380,000 results)
• This form appears in Wikipedia's list of JLPT N3 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 254 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 14366
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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Example sentences:
あと
じっぷん
10分

I will be free in ten minutes.
もう
でんわ
電話
らなくて
はなりません
でんわ
電話
っている
ひと
いるです
I've got to hang up now. Someone is waiting to use the phone.
こばら
小腹
すいた
I'm a little peckish!
すく
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 70% of the time
• Google Japan frequency rank: 50,000 (about 8,840,000 results)
• Wikipedia most common 20000 words rank: 8514
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
VIEW INFLECTIONS
クウ   から empty   あ to be empty   あける to empty, vacate   そら sky   
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コウ   ク    work; construction; craft   
ケツ   あな hole   
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katakana 'ha'; eight
roof   
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