重合 chónghé to match up
to match up; to coincide
How to remember 重合: 重 heavy + 合 join together = to match up.
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How it is used
- 'To coincide, match up exactly, overlap perfectly' - 两条线重合 (liǎng tiáo xiàn chónghé) the two lines coincide; 观点重合 (guāndiǎn chónghé) views align.
- Read chónghé; implies full congruence, not just partial overlap. Common in geometry and describing matching positions/opinions.
- Contrast 重叠 (chóngdié), which is partial layering; 重合 is two things falling into the same place.