spring for something
phrasal verb with spring verb [ I usually + adv/prep ] uk/sprɪŋ/ us/sprɪŋ/ sprang or sprung | sprung
US informal（通常替其他人）支付（或购买）（某物）
to pay for or buy something, often for someone else
They offered to spring for the tickets. 他们愿意出钱买票。