noun
a person who observes or looks out for something, such as a lifeguard or a person who assists in weightlifting by watching for proper form
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The spotter carefully observed the movements of the target and relayed information to the team.
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Hey, can you be my spotter while I try to parallel park?
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I always bring my spotter with me to the gym to make sure my form is on point.
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In the world of finance, having a good spotter can help you navigate through risky investments.