"Liquid courage" refers to the temporary increase in confidence that some people experience when they drink alcohol. It implies that alcohol can help individuals feel bolder and less inhibited in various situations. Full definition
But don't rely on drinking alcohol to loosen up or for liquid courage. (elitesingles.co.uk)
Sometimes when you've got a little liquid courage in your system and you're out with friends, it can feel less awkward going up to a pretty woman. (datingadvice.com)
I would definitely have to take a shot of liquid courage to wear it, because I tend to shy away from attention. (lipglossandlace.net)