Their hearts were in sync.
Meaning: This sentence means that they felt the same way about things and they understood each other very well.
Choice of Words: Hearts are the organs that pump blood through the body. Sync is short for synchronization, which means happening at the same time or in a coordinated way. When you put them together, "Their hearts were in sync" means that their hearts were beating at the same rate and in harmony, symbolizing their deep connection and understanding.
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