Definition: To take air into the lungs and then expel it, especially as a regular physiological process.
Either handshape "5" (more natural) or close "5" is acceptable.
In Yusuf's artist statement, he explains that the Black man shows the ASL sign "breathe" on the blue heart. This image refers to the George Floyd tragedy. Floyd died from not being able to breathe while the white police officer held Floyd down on the neck and ignored Floyd repeatedly telling, "I can't breathe, officer."