work something under something
to manipulate something beneath something. She worked the knife blade under the window and tried to pry the window up. Work the envelope under the office door. She will find it when she opens the door in the morning.
work under someone
to have one's work supervised by someone. I work under Michael, who is head of the department. Who do you work under?
work under something
to work underneath something. I have to work under the car for a while. Please don't start it. The plumber had to work under the house to fix the pipes.