I took a quick look-in at the store.

He is the second in command of the army.

The actor couldn't make it to the shoot, so they had to find a stand-in.

Stock-in-trade refers to the goods or merchandise that a business keeps on hand for regular trade or sale.

I tucked in to a delicious meal.

The whipper-in is responsible for managing the hunting dogs during the fox hunt.

I had a knot in my stomach when I heard the news.

The project is still in progress.

I know it's tough, but hang in there!

I don't mean to be butting in, but I have a suggestion.