Through thick and thin
Definition 1 of 1
Pro Tip 1/3Loyalty Connotation
Expresses strong loyalty, suggesting unwavering support in all sorts of situations, especially the hard ones. 
She supported her team through thick and thin, never losing faith.
Pro Tip 2/3Emotional Bond
Often used to describe deep relationships where individuals stay together despite challenges. 
Married for fifty years, they've been through thick and thin together.
Pro Tip 3/3Not Literal
It's not about physical thickness or thinness but about staying together through good and bad times. 
Their friendship survived through thick and thin, even when they were miles apart.
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