They were the best of friends forever.
Meaning: In the past tense of be of the highest quality or most suitable people who know and like each other and spend time together for an infinite or indefinite period of time.
Choice of Words: Were is the past tense of be. Best means of the highest quality or most suitable. Friends means people who know and like each other and spend time together. Forever means for an infinite or indefinite period of time.
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Related Expressions