The sense of being able or emboldened to say something to someone over digital media (text, instant message, etc.) that one would not normally say face to face.

(idiomatic) Alcohol drunk to induce a feeling of courage.

(idiomatic, almost always preceded by the) Steadfast adherence to one's beliefs or principles, especially in the face of criticism or other opposition.

Synonym of pluck up one's courage

To muster the bravery and will to do something.

(idiomatic) To summon up one's courage in readiness for a difficult or dangerous action.