one-man band

A company or organization where most or all of the work is handled by one person. Most small businesses start out as a one-man band with the owner doing everything himself until he can afford to hire help.

a one-man band

COMMON If you describe a man or an organization as a one-man band, you mean that one man does every part of an activity himself, without help from anyone else. He seemed to be a one-man band, taking orders, and cooking and serving at table. I'm a one-man band, Mr Herold. At present I haven't even got a secretary. Note: A woman who is like this is sometimes described as a one-woman band. I am no better at being in two places at once than the next one-woman band. Note: A one-man band is a street entertainer who plays several different instruments at the same time.