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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!
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.
1. verb To collapse into a hollow area below, as of a physical structure or formation. We were able to get the kids out of the house before the roof caved in.
2. verb To collapse, faint, or die, as from over-exertion. I hardly remember the end of the marathon because I caved in as soon as I crossed the finish line.
3. verb To submit, concede, or yield (to someone or something); to surrender or acknowledge defeat. Under the threat of a strike, the management caved in and agreed to reinstate annual pay increases for all employees.
4. noun A collapse into a hollow area below, as of a physical structure or formation. When used as a noun, the phrase is usually hyphenated. The fear of every miner is a cave-in.
the roof caves in
The situation collapses; everything goes wrong. Typically used in the past tense. I was living paycheck to paycheck and getting by OK, but then the roof caved in. I lost my job, and then my car and my house.
[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.
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]
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.