 Explain the meaning of the expression "to steal one's thunder". 
في ذلك البيت (فَيا لَيتَ الشَبابَ يَعودُ يَوماً) جاء معنى المشيب أي سن الشيب عندما يصبح شعر الرأس أبيض والمعنى بعد أن وصل الشاعر إلى سن الشيخوخة وشاب شعره وضعفت قوته يتذكر في حسرة شبابه حيث القوة والفتوة ويتمنى عودة تلك المرحلة كي يشكو إليها حاله.
 The expression "to steal one's thunder" is used figuratively to describe a situation in which one person uses or claims another person's ideas, achievements or successes as their own. It originates from the 1700s and describes a literal incident in which a company of traveling actors discovered a machine they could use to create a sound like thunder from the stage. When another company of actors used the machine without the credit or permission of the first company, it was said that they had "stolen their thunder."
اشرح معنى عبارة "ليت الشباب يعود يوما".