be engaged in physical or mental activity in order to achieve a purpose or result, especially in one's job; do work.
an engineer who had been working on a design for a more efficient wing
(of a machine or system) operate or function, especially properly or effectively.
his cell phone doesn't work unless he goes to a high point
bring (a material or mixture) to a desired shape or consistency by hammering, kneading, or some other method.
work the mixture into a paste with your hands
move or cause to move gradually or with difficulty into another position, typically by means of constant movement or pressure.
comb from tip to root, working out the knots at the end