"Long-term support" refers to assistance or aid provided for an extended period. There are several other terms that can be used interchangeably with this phrase. "Sustained assistance" is a synonym for long-term support and implies that the help will continue over a prolonged period. Another term that can be used instead of long-term support is "ongoing assistance," which suggests that the aid will be given continuously. "Enduring aid" is also a synonym of long-term support and implies that the help will last a long time. Additionally, "persistent aid" is another synonym that can be used to describe the idea of long-term support.