busy as tree
Busy as a tree is defined as being loaded and slammed with alot of work but don't show it to people. Such as having 3 research papers due this weekend but don't look stress out about it on their day to day life when they really are thinking about it mentally. They are do have a strong bark to hide the craziness of their lifes.
Damm timbers and her partner mr.tree don't show it but they are busy as tree!