To make an effort.
An endeavor.
The work involved in performing an activity; exertion.
A force acting on a body in the direction of its motion.
The state of being negligent.
The breach of a duty of care: the failure to exercise a standard of care that a reasonable person would have in a similar situation.
The tort whereby a duty of reasonable care was breached, causing damage: any conduct short of intentional or reckless action that falls below the legal standard for preventing unreasonable injury.