We need to call in the big guns to finish this project.
big gun
idiomA person, group, thing, or course of action that is powerful, influential, or particularly effective.
The company brought in the big guns from the legal department to handle the difficult contract negotiations.
Recognizing that the local team lacked the necessary influence, the board sent in the big guns to sway the final vote.
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big boy
A large object or person.
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big boys
The people or bodies with the most influence and/or power.
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big break
A breakthrough, especially the first big hit of a previously unknown performer or performers in the entertainment industry.
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big bucks
Lots of money.
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big cheese
A very important figure, especially a high-ranking person in an organization.
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big deal
Something very important or difficult; a matter of great concern; a considerable feat or achievement.
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big dick energy
Unassuming self-confidence.
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big end of town
The top end of town.