特に難しいときに、自分の内側から勇気、力、意志の強さをふりしぼること。
"She summoned up every ounce of courage she had and stepped onto the stage."
He had to summon up his courage and speak.
— J.K. Rowling, 'Harry Potter and the Philosopher's Stone', 1997 (paraphrased from narrative context)