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Master

Noun - Someone who has control over others.

(Can also refer to a male teacher, schoolmaster, or tutor. Someone who  who holds a master's degree.)

Verb - To overcome or defeat, someone or something.

Copy

Verb - To make a copy or copies of something.

Noun - An imitation or reproduction of an original.

Master copy

Noun - An original creation (i.e. a document) from which copies can be made.

Example Sentence:-

"You left the master copy on the photocopier; you ought to look after it."