slump

verb
1
to fall in price, value, number, etc., suddenly and by a large amount
افت کردن, افت شدید کردن, نزول ناگهانی کردن, سقوط کردن, افت قیمت کردن
synonym drop
2
to sit or fall down heavily
نشستن با شدت, افتادن سنگین
Exhausted, he slumped down in his chair.
She slumped to her knees.
noun
1
a sudden fall in sales, prices, the value of something, etc.
افت, سقوط, رکود, نزول, افت ناگهانی
synonym decline
2
a period when a country’s economy or a business is doing very badly
رکود, افت اقتصادی, تنزل اقتصادی, نزول
the slump of the 1930s
Housing sales are finally coming out of a three-month slump.
The toy industry is in a slump.