英和和英

open

open cover

of a thing, to open to its full width

not open

not open

open wide

slightly open

Open.

something to be opened

to open a gate

to extract the square root （of a number）

a natural opening in something

an open window

to hold a meeting

an open ceiling

to open widely

a hinged door

give a recital

It opens.

The door is open.

open the lock of

being widely open

The curtain rises

The plays begins

The performance commences.

to feel relieved―feel relief

an enlightened age

reeve an opening

be wide open

open ground