1. To make a great effort at a mental or physical task.
2. To put to use; SYN. exercise.

1. To put into service; make work; make use of of employ for a particular purpose:; SYN. utilize, utilise, apply, employ.
2. To seek or achieve an end by using
3. To take or consume (regularly)
4. To use up, consume fully; SYN. expend.