朽
xiǔ
#2,539 most
frequent character
rotten
Character breakdown
Source: Make Me a Hanzi.
朽 has 木 'wood' as its meaning part and 丂 kǎo giving the sound. The sound link is not clear in Mandarin. It first meant 'rotten, decomposing'; from there came 'decrepit' and 'senile'.
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