noun
a role or character that one is portraying in a performance or situation
verb
to behave in a manner consistent with a particular role or character
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It is important for actors to fully understand their characters in order to effectively act the part.
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Just try to act the part and pretend like you know what you're doing.
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She's really good at acting the part of a tough girl, even though she's actually really sweet.
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In order to succeed in this business, you have to be able to act the part of a confident and capable leader, even if you're feeling unsure.