One-man is a term used to refer to something that is done by or belonging to a single person. There are several synonyms for the word "one-man," including solo, individual, independent, solitary, and lone. When describing a business, "sole proprietorship" is a synonymous term. Other phrases like "single-handed," "unaided," and "self-sufficient" also convey the idea of one-man or one-person. The term "solo effort" is particularly apt when describing an activity that is accomplished by a single person without assistance from others. The use of precise synonyms can help in effectively communicating the meaning of the word "one-man" within sentences.