固
gù
#891 most
frequent character
hard, strong, solid, sure, assuredly
Character breakdown
Source: Make Me a Hanzi.
固 shows city walls, 囗, with 古 gǔ meaning solid or sturdy. 古 also gives the sound. It first meant solid, sturdy city walls. The meaning grew to hard or strong, then fixed, and finally undoubtedly or of course.
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