noun:

• small knife that is largely ornamental or used to cut open letters and the like ➜ 小刀

godan ~す verb / transitive:

• to bring into the open; to reveal; to uncover (e.g. evidence); to bring to light

ichidan verb / transitive:

• to wrench open; to prize open; to pick (lock)

godan ~る verb:

• to hit and break open; to crush; to smash - colloquialism

godan ~く verb / transitive:

• to cut open (a tied bundle); to release (prisoners)

ichidan verb / intransitive verb:

• to be open - often as 開かれた, 開かれている ➜ 開く【ひらく】

ichidan verb / intransitive verb:

• to burst open; to pop; to split

ichidan verb / transitive:

• to wrench open

expression / godan ~く verb:

• to start an act (of a play); to have curtains open; to have an (event, period of history, etc.) start ➜ 幕を閉じる

godan ~す verb / transitive:

• to expose; to lay open (e.g. secret)
• to take to pieces
• to kill; to murder

expression / godan ~る verb:

• to bust down a door; to break a door open

expression / godan ~る verb:

• to stop an inside seam rolling about; to press open a seam (and open the left and right sides out)

godan ~す verb:

• to leave on; to leave running; to leave lying around; to leave (a faucet) open

godan ~す verb:

• to leave on; to leave running; to leave lying around; to leave (a faucet) open

godan ~く verb / transitive:

• to cut; to slit; to cut open

godan ~る verb / intransitive verb:

• to be separated (of clothing); to be exposed; to be wide open
• to stand with one's limbs apart; to block the way ➜ 立ちはだかる

expression:

• words can lead to disaster; the tongue is the root of calamities; the more you open your mouth the more likely you are to put your foot in it - proverb

godan ~ぶ verb / intransitive verb:

• to pop off; to pop out; to fly off; to shoot off; to burst open

ichidan verb / intransitive verb:

• to burst (open); to break; to split

godan ~く verb / transitive:

• to tear; to rip up ［裂く］
• to cut up; to cleave; to cut open (esp. the abdomen)
• to forcibly separate (e.g. two lovers) ［裂く］
• to spare (time, money, etc.); to use part of something ［割く］
• to have a tattoo in the corner of one's eye - archaism ➜ 黥く

godan ~す verb / transitive:

• to kick free; to kick loose; to kick away - archaism
• to kick open (e.g. a sliding door) - archaism

noun:

• ring; link
• open spirals of heavy metal wire twisted into a kettle and used to lift it (tea ceremony)

noun / ~の noun:

• glass-sided
• aboveboard; open to scrutiny

~する verb (spec.) / transitive:

• to push aside; to overcome (e.g. difficulties); to reject
• to align; to put in order
• to push open - archaism

noun:

• backyard
• background
• room in a store or restaurant not open to customers (often storage room) - colloquialism