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1)
#439

Inflections of 空ける

Common
Meaning
    1. to open (a door, etc.); to unwrap (e.g. parcel, package); to unlock
      Only applies to 開ける
      The three boys opened the doors of the building.
    2. to open (for business, etc.)
      Only applies to 開ける
    3. to empty; to remove; to make space; to make room
      esp. 空ける
      Empty the purse into this bag.
    4. to move out; to clear out
      esp. 空ける
    5. to be away from (e.g. one's house); to leave (temporarily)
      esp. 空ける
    6. to dawn; to grow light
      esp. 明ける
    7. to end (of a period, season)
      esp. 明ける
    8. to begin (of the New Year)
      esp. 明ける
    9. to leave (one's schedule) open; to make time (for)
      esp. 明ける
      Please leave next Saturday afternoon free.
    10. to make (a hole); to open up (a hole)
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2)

Inflections of 空ける

Meaning
    1. to become empty (hollow)
    2. to relax from a tense situation into a vacant or absent minded state
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3)
#1,345

Inflections of 空く

Common
Meaning
    1. to become less crowded; to thin out; to get empty
      Which car is less crowded?
    2. to be hungry
      We aren't very hungry yet.
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4)
#9,182

Inflections of 開く

Common
Meaning
    1. to open (e.g. doors)
      esp. 開く
      The door yielded to a strong push.
    2. to open (e.g. business, etc.)
      esp. 開く
    3. to be empty
      esp. 空く
    4. to be vacant; to be available; to be free
      esp. 空く
      Are you free after school?
    5. to be open (e.g. neckline, etc.)
      esp. 明く
    6. to have been opened (of one's eyes, mouth, etc.)
      esp. 明く
    7. to come to an end
      esp. 明く
    8. to open (one's eyes, mouth, etc.)
      esp. 明く
    9. to have a hole; to form a gap; to have an interval (between events)
      The leather jacket has worn out at the elbows.
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5)
#13,078

Inflections of 穴を開ける

Meaning
    1. to cause a loss
    2. to make a hole (in)
      A rat chewed a hole in the wall.
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7)
#26,711

Inflections of 道を空ける

Meaning
    1. to make way for; to make room for; to get out of the way
      esp. 道を空ける
      Please move out of the way so this lady can go through.
    2. to pave the way for; to open up opportunity
      esp. 道を開ける
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10)
#98,686

Inflections of ぶち開ける

Meaning
    1. to forcefully open up (a hole; in a wall, etc.)
    2. to speak frankly; to open one's heart
    3. to throw out (everything inside); to empty (e.g. a box)
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11)
#81,115

Inflections of 水をあける

Meaning
    1. to open up a lead (over one's opponent)
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