He plays the four-string guitar in his band.

He played the four-string banjo at the concert.

He plays four-string banjos in his band.

Learning to play the piano is another string to her bow.

He felt like he was pushing a string uphill trying to convince his boss to give him a raise.

I need to convert a C-style string to a std::string.

She always harps on the same string, complaining about her job.

She is having the world on a string.

He had the world on a string.

He has the world on a string.