openopen2 ●●● also open up verb 1 [intransitive, transitive] to move something so that something is not closed or covered, or to be moved in this way: Dan’s opening his birthday presents. The supermarket doors open automatically when you walk up to them. Meg opened her eyes wide. She opened the curtains. Open up the window, will you?WORD CHOICEDo not use open and close to talk about things that use electricity or things that provide water or gas. Use turn on/off instead: Can you turn off the stove? I turned on the TV.For things that use electricity, you can also use switch on/off: Don’t forget to switch off the lights.THESAURUSunlock – to open a door, drawer, etc. with a keyunscrew – to open a lid on a bottle, container, etc. by turning itunwrap – to open a package by removing the paper that covers itunfold – to open a piece of paper, a cloth, etc. that was foldedunfasten/undo – to open something that is fastened or tied, for example a seat belt or a piece of clothing → close12[intransitive] if a store, bank, or public building opens at a particular time, it begins to allow people inside at that time: What time does the bookstore open on Sundays?3[intransitive, transitive] to start, or to make something start: The restaurant opens next month. I want to see the new play that’s opening on Broadway this week. He opened up a checking account.4[intransitive, transitive] to spread something out, or become spread out: I can’t open my umbrella. The roses are starting to open up. Open your books to page 153.5[transitive] to make something available to be used or visited: Snowplows were out opening up the streets. Parts of the White House will be opened to the public.6open fire (on somebody/something) to start shooting at someone or somethingopen up phrasal verb1open something ↔ up to become available or possible, or to make something available or possible: Education opens up all kinds of opportunities.2to stop being shy and say what you really think