In both good and bad times; under all circumstances.
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To stay loyal and committed to someone through all of life’s challenges — good times and bad.
When someone stands by you through thick and thin, they’re there no matter what happens.
It’s often used to describe deep friendships, long marriages, or devoted teammates.
"For Better or Worse"
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Committed to staying together regardless of what happens, often from wedding vows
"In Good Times and Bad"
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A direct way of saying commitment covers all circumstances, less idiomatic
"Through Thick and Thin"
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Stay loyal and committed through all circumstances