noun, noun or participle which takes 'suru'
with redoubled courage; inspired with fresh courage
A set phrase meaning one's courage is greatly boosted, often used in the pattern 勇気百倍する or 勇気百倍になる. The literal sense is 'courage multiplied a hundredfold'.
友達の応援で勇気百倍した。
My friend's support gave me a huge boost of courage.
彼の言葉を聞いて勇気
Hearing his words, I felt my courage redoubled.