The most basic and important part of something is the meat and potatoes.
The meat and potatoes of this newspaper is the business news.
Volunteer work is the meat and potatoes of the programme.
When you find a task, that others find difficult, easy and pleasant, it is meat and drink to you.
Most people dislike making speeches in front of audiences but it's meat and drink to me.
When something seems suspicious, dishonest or false, it is fishy.
I'm not sure I believe him. His explanation sounded fishy to me.
Your bread and butter is your job - the activity that provides you with the money you need to live.
Painting houses is my bread and butter.
When something tastes bittersweet, it's both bitter and sweet at the same time. Some chocolates taste bittersweet.
Bittersweet is also used to describe a situation that is enjoyable and painful; a mix of sadness and happiness.
My last day of university was bittersweet. I was happy to be graduating but sad because I knew I would never see some of my classmates again.
Now choose the correct idiom in these sentences: