To cause someone or something to gain weight, often used in a figurative sense to indicate increase or enlargement.

वजन बढ़ाना

English Usage: "They decided to fatten out the cattle before the sale."

Hindi Usage: "उन्होंने बिक्री से पहले मवेशियों का वजन बढ़ाने का निर्णय लिया।"