
凹 - Concave
Between a left wall and a right wall, a sunken dip makes a snug hollow. Remember Japanese 'dekoboko' (凸凹): 凹 is the 'boko' part, the Concave side.
All Mnemonics (3)

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凹 - Concave
Index # 1262
Grade 7
5 strokes
JLPT Level : N1
Readings : オウ