• to buoy up, to encourage, to hearten, to incite, to nerve
• audaciousness, audacity, bravery, courage, fearlessness, fortitude, gallantry, heart, manhood, nerve, pluck, prowess, spirit, spunk, valor, valour, vent
• be of good cheer!, buck up!
• encouragement, incitement
• can't say bo to a goose, diffident, faint, faint-hearted, half-hearted, pusillanimous, shy, timid, timorous