To do something/anything even in the face of fear.  Not to be foolish and take risks for the sake of laughs but to truly do something you know you must in order to make things right, to have integrity, to humble oneself, apologize or even stick up for self – even if you never have before and are afraid to step into this new territory of bravery.  The word comes from the Latin cor or French coeur – both meaning heart.  It takes a big, open heart to do the right thing with valor and honorably.

To discard the shallow and seek the profound is the way of a person of courage. – Nichiren