Simple past tense and past participle of backstop.(verb)
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Use "backstopped" in a sentence
"But it writes policies for less than 10% of the market, down from pre-crisis levels when insurers backstopped half the market."
"More recently, they have backstopped regional subsidiaries of Greek banks to ensure the region was not hit hard by the financial meltdown in that country."
"It's also worth noting that, though he backstopped the Devils to three Stanley Cups, Brodeur has never won the Conn Smythe Award as the NHL's postseason most-valuable player."