英和和英

open cover

to open a package

undo the parcel

reeve an opening

an unsealed letter

to open and shut

Open the screen

to break the seal―（みだりに開封するの意味なら）―tamper with the seal

to open (something) completely

to extract the square root （of a number）

open the lock of

to close a banquet―（西洋なら）―go to the drawing-room

to expand the chest

to make a beginning

open the gate

to make a beginning―pave the way for something

to pave the way for something

come open suddenly

to extract the square root of a quantity

open the door

an open window

an open port

open the party

kick open the door

open the zipper of

break the window open

to open a gate

to open the gate

to wrench a lid open

close the window