After getting the promotion he had been waiting for, he gave each one of his friends in the department a high

English as a Second Language English Vocabulary, Grammar and Idioms
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After getting the promotion he had been waiting for, he gave each one of his friends in the department a high ...... (*) handshake (*) slap (*) five (*) opinion

This is a companion discussion topic for the original entry at https://english.best/questions/11252,after-getting-the-promotion-he-had-been-waiting-for-he-gave-each-one-of-his-friends-in-the-department-a-high-___/
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My wrong answer is “After getting the promotion he had been waiting for, he gave each one of his friends in the department a high handshake”
The correct answer is five. What is the meaning of “he gave each one of his friends in the department a high five”?