The phrase "dark period" typically refers to a time of sadness, difficulty, or less favorable circumstances. It is a period when things feel gloomy or troubled. Full definition
But well run, cyclical companies will have their day in the sun, especially after dark periods of low capital investment and capacity reductions. (business.financialpost.com)
Follow her on her journey to healing and recovery from a very dark period in her life. (aabreastfeedinghelpinaz.com)
According to the included booklet, this was a particularly dark period for him in his personal life, being betrayed himself left and right. (digitalchumps.com)