核对 (hé duì) is a verb meaning 'to double-check' or 'to verify'—to carefully compare information against a source or standard to ensure accuracy and consistency. The character 核 (hé) means 'core', 'essence', or 'to examine thoroughly', while 对 (duì) means 'to match', 'to correspond', or 'to face'. Together, they convey the idea of examining something closely to confirm it 'matches up' correctly with a reference point.

This word is commonly used in daily life, work, and study contexts—such as checking bank statements, reviewing documents before submission, confirming orders in restaurants, or verifying answers on exams. It implies a deliberate, methodical process—not just a quick glance, but a focused comparison. 核对 often appears with objects like numbers, lists, names, dates, or records, and frequently follows verbs like 请 (qǐng, 'please') or 要 (yào, 'must') to indicate necessity or instruction.