liquid courage

courage of one's convictions

Steadfast adherence to one's beliefs or principles, especially in the face of criticism or other opposition.

digital courage

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.

Dutch courage

The courage or bravado induced by alcohol.

take one's courage in both hands

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