모으다 is bringing things together, with -게 giving the manner. It covers saving money (나 어렵게 모은거야 'I saved that up the hard way', 돈을 급하게 모아야 되는 상황 'needing to raise money in a hurry'), collecting things, putting your hands together (형 왜 두 손을 공손하게 모아요! 'why are you holding your hands so politely?'), and pooling requests: '저희 물이랑 음료수 좀 주세요' 이렇게 모아서 주문하는 'putting the order together like that'.