Select the most appropriate meaning of the underlined idiom in the sentence.

His family has supported him through thick and thin.

in times of good and bad fortune

The most appropriate meaning of the underlined idiom in the sentence is >in times of good and bad fortune.<

The idiom "through thick and thin" means to support someone or something unconditionally, regardless of the circumstances. It is a metaphor for being there for someone no matter what happens.

In the sentence, the speaker is saying that the family has supported the person through both good times and bad. They have been there for them when they were successful and when they were struggling.

The other options are not correct.

• When there was a lot of work to be done: This does not mean to support someone unconditionally.
• On occasions when he had a lot of money: This does not mean to support someone unconditionally.
• Even though he has put on weight: This does not mean to support someone unconditionally.