the power or force that can be supplied for some purpose by human beings exerting physical effort, or the power that is thus available;
e.g. They gave the project all of the man power they had to meet the deadline.
(noun)
the total number of people who are available and qualified to perform a particular task or service, or the number of people who are working on it (often used as "manpower");
e.g. We are lacking the manpower we need to put our plan into effect.