take a big load on(someone: I took a big load on me expecting I can handle it by myself. – Я взвалила на себя большой груз, расчитывая, что справлюсь сама.ART Vancouver)
take on this responsibility(If you are choosing an attorney—this may be your spouse, a close family member or friend—you may also want to ensure that whomever you choose: -Knows how to manage money and property. -Is reliable and available to take on this responsibility. -Clearly understands what is expected of them. (rbcroyalbank.com)ART Vancouver)