sign [ˈsaɪn]

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¹ sign noun

• a piece of paper, wood, etc., with words or pictures on it that gives information about something
• something (such as an action or event) which shows that something else exists, is true, or will happen —often + of
• a motion, action, or movement that you use to express a thought, command, or wish

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² sign verb

• to write (your name) on something
• to write your name on (something) especially to show that you accept, agree with, or will be responsible for something
• to hire (someone) to do something especially by having that person sign a contract