close up phrasal verb (see also close)

1. close something ↔ up if a shop or building closes up or is closed up, it stops being open to the public for a period of time:
The resorts are all closed up for the season.

2. close up shop to stop doing something for a period of time or permanently:
When it rains, there is no alternative but to close up shop.

3. if a group of people close up, they move closer together

4. close something ↔ up if a wound closes up or if someone closes it up, the edges grow together again or are sewn together:
The scar is closing up nicely – it’ll soon be time to take the stitches out.

5. to become narrower or to shut:
The flowers close up at night.
Occasionally the channel widened then closed up tight again.

6. to refuse to talk to someone about something:
The moment I said I was a police officer, everyone would close up like a clam.

[TahlilGaran] Dictionary of Contemporary English ▲

close-up /ˈkləʊs ʌp $ ˈkloʊs-/ noun [uncountable and countable]
a photograph or part of a film in which the camera seems to have been very close to the picture it took
close-up of
a close-up of her face
in close-up
Much of the movie is shot in close-up.

[TahlilGaran] Dictionary of Contemporary English ▲

close up
noun
ADJ. extreme CLOSE-UP + NOUN detail The slide gave close-up detail of petal formation.
photograph, picture, shot, view
PREP. in ~ The wound was photographed in extreme close-up.

[TahlilGaran] Collocations Dictionary ▲

close up
n. A photograph, motion picture, or video camera shot taken at very close range.
Directors of movies frequently show close-ups of the main characters.

[TahlilGaran] English Idioms Dictionary ▲