Simple past tense and past participle of double.(verb)
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Use "doubled" in a sentence
"For example, in this study, they are including people who are what they call doubled up, meaning you had problems with your home, you moved in with a sister or you lived with your parents, and you have children there."
"Its first-half revenue from nonfuel purchases more than doubled from a year earlier to 2.64 billion yuan ($394 million)."
"Earlier this year, the bank's chairman, Ali Divandari, said Mellat's foreign-exchange reserves had doubled from a year earlier, despite the American sanctions."