어서 살리다

save someone by doing X

살리다 is the causative of 살다: to keep alive, rescue or revive. -아/어서 names the means — 우리한테 돈을 줘서 살려달라 'save us by giving us money', 등장해서 살리고 'shows up and saves them'. It has a second sense as well, bringing something out so that it works: 리듬감에 섞어서 살려내는데요, making a sense of rhythm come alive.