What is "heartens"

Usage examples of "heartens".

Certes, this heartens me, wherefore I bid ye: once more into the hungry, grim-a-visaged fray, b'yr deity whatsoever once more!

Their idealism heartens me, but I have mixed feelings about their goal.

Again we reach the ships, but here they turn to fight, until a clap of thunder heartens us, and we are among them with our horses and chariots, and the Achaeans climb to the black sterns of their ships.