Components
開く is an exact match with one form of the following word:
開く
BOOST
Reading : ひらく   
'ku' godan verb, intransitive verb, transitive verb
1. to open; to undo; to unseal; to unpack
2. to bloom; to unfold; to spread out
3. to open (for business, e.g. in the morning)
4. to be wide (gap, etc.); to widen
'ku' godan verb, transitive verb
5. to hold (meeting, etc.); to give; to open
6. to found (nation, dynasty, sect, etc.); to open (a new business); to set up; to establish; to start
7. to open (ports, borders, etc.)
8. to open (an account)
9. to open up (new land, path, etc.); to clear; to develop  (see also: 拓く)
10. to open (a file, etc.)  (computer terminology)
11. to extract (root); to reduce (equation)  (mathematics)
12. to cut open (fish)  (as 魚を開く; food term)
13. to change (kanji into hiragana)
'ku' godan verb, intransitive verb
14. to flare (e.g. skirt)
15. to slacken (into a poor posture)  (as 体が開く, 肩が開く, etc.; sports term)
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My current mastery of 開く:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 3 (among the 3,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 133,691 which gives a rank of 2,433
開く 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 90% of the time
• Google Japan frequency rank: 7,000 (about 119,000,000 results)
• This form appears in Wikipedia's list of JLPT N4 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 264 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 1219
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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Example sentences:
こうざ
口座
ひら
きたい
です
I'd like to open an account.
かれ
あした
明日
パーティー
ひら
きます

They are having a party tomorrow.
こんばん
今晩
パーティー
ひら
きましょ

Let's give a party this evening.
ひらく
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 60,000 (about 6,430,000 results)
• Wikipedia most common 20000 words rank: 13739
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
VIEW INFLECTIONS
カイ   あ to (be) open   あける    ひら to open (something)   ひらける to open out (eg view)   
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start, initiate   
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イチ   イツ   ひと    ひと- one   
twenty; two hands   
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ジュウ   ジッ   と    とお ten   
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stick   
モン   かど gate   
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