The siblings supported each other through thick and thin.
Meaning: This means to be there for each other through good and bad times. It's like saying, They were always there for each other, no matter what.
Choice of Words: Siblings are brothers and sisters. Supported is a verb that means to help or encourage someone. Thick and thin is an idiom that means through good times and bad times. When you put them together, "siblings supported each other through thick and thin" means that the brothers and sisters helped and encouraged each other through good times and bad times.
Alternative Expressions
Related Expressions