Meaning of “open” - Learner’s Dictionary

open

verb uk us /ˈəʊpən/
NOT CLOSED [ I, T ]

A1 If something opens, it changes to a position that is not closed, and if you open it, you make it change to a position that is not closed:

to open a door/window
The gate won't open.
Don't open your eyes yet.
REMOVE COVER [ T ]

A2 to remove part of a container or parcel so that you can see or use what it contains:

Karen opened the box and looked inside.
Why don't you open the envelope?
I can't open this bottle.
PREPARE FOR USE [ I, T ]

If an object opens, the parts that are folded together move apart, and if you open it, you make the parts that are folded together move apart:

Shall I open the umbrella?
Open your books at page 22.
START WORK [ I ]

A2 If a shop or office opens at a particular time of day, it starts to do business at that time:

What time does the bank open?
COMPUTERS [ T ]

B1 to make a computer document or program ready to be read or used

START OFFICIALLY [ I, T ]

B2 If a business or activity opens, it starts officially for the first time, and if you open it, you make it start officially for the first time:

That restaurant's new - it only opened last month.
Several shops have opened up in the last year.
MAKE AVAILABLE [ T ]

to allow people to use a road or area:

They opened up the roads again the day after the flooding.
open an account

to make an arrangement to keep your money with a bank:

Have you opened a bank account yet?
→ See also open the floodgates

(Definition of “open verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)