The Collaborative International Dictionary
man hour
man hour \man hour\, man-hour \man-hour\n. The quantity of work which one person can perform in one hour; -- often an estimate made for the purpose of deciding whether to undertake a project, and sometimes used in accounting; as, it will take a hundred man-hours to write the program.
WordNet
man hour
n. a time unit used in industry for measuring work [syn: person hour]