英語候補to turn the potential disaster to one's advantageto turn misfortune into fortune (esp. through one's own efforts)
禍福は糾える縄のごとしかふくはあざなえるなわのごとしことわざ未分類fortune and misfortune are intertwinedfortune and misfortune come by turns
足元を見るあしもとをみる慣用句ことわざ未分類to size up (e.g. customer when setting a high price)to take advantage (e.g. of a weak situation)