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cave
an Aladdin's cave
A place full of treasures. (In The Arabian Nights, Aladdin finds a magic lamp in a cave.) I know you think your garage is full of junk, but to an antiques collector like me, it's an Aladdin's cave!
man cave
A room or area of a house designated for a man to retreat from the rest of his family and relax or engage in hobbies. My husband is watching the football game in his man cave right now.
cave in
[for a roof or ceiling] to collapse. The roof of the mine caved in when no one was there. The tunnel caved in on the train.
cave in (to someone or something)
Fig. to give in to someone or something. Finally, the manager caved in to the customer's demands. I refuse to cave in under pressure from my opponent.
cave in (to somebody/something)
to agree to something after originally opposing it give in (to somebody/something) If the pressure from your parents becomes too strong, you might cave in and go to graduate school.
Etymology: based on the literal meaning of cave in (to suddenly fall inward)
an Aladdin's cave
(British) a place that contains many interesting or valuable objects (often + of ) We found a shop that was a real Aladdin's cave of beautiful antiques.
the roof caves/falls in
(American) if the roof caves in, something very bad suddenly happens to you For the first six years of my life I was happy. Then my father died and the roof caved in.
See hit the ceiling, raise the roofcave in
1. Fall in, collapse, as in The earthquake made the walls cave in. [Early 1700s]
2. Give in, admit defeat, as in The prosecutor's questions soon made the witness cave in. [Early 1800s]
3. Collapse, faint, or die from exhaustion, as in After a twenty-mile hike I caved in. [Mid-1800s]
cave in
v. To give way; collapse: The sides of the snow fort caved in. The mine shaft caved in on a group of miners, but fortunately they were rescued.