amass 
/əˈmæs/ verb
amass·es; amassed; amass·ing /əˈmæs/ verb [+ obj] : to gather or collect (something, such as a large amount of money) especially for yourself
▪ By the time he was 21, he had already amassed [=accumulated] a great fortune. ▪ The police are amassing [=gathering] further evidence against him. ▪ They've amassed a wealth of information.
▪ By the time he was 21, he had already amassed [=accumulated] a great fortune. ▪ The police are amassing [=gathering] further evidence against him. ▪ They've amassed a wealth of information.
