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to come out, to go beyond, to occur, to rise
chū
Two mountains 山 behind each other (traditionally "sent behind the mountains" for exile)
Behind a mountain another comes out.
| 出 凵 山 |
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to hit, to strike, to break
jī Bottom: container 凵, similar to a can 缶 (lid  and can opener 十 of that can 凵, but without stick ノ)
He takes the stick ノ from the can 缶 and hits/strikes with it. | 凵 缶 |
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tooth, teeth
chǐ
Top: to stop 止 (here: nose), bottom: open mouth 凵 with teeth 人
Below the nose is an open mouth with teeth.
| 齒 凵 |
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to contain, to include, culvert
hán
Left: water 氵, right: envelope 函 (container 凵, e.g. jug 乛, water 水)
Water is poured from a jug into the container, which then contains it.
| 氵 乛 水 凵 |
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vicious, fearful, fierce, ominous, inauspicious
xiōng
Container 凵 with a mark 㐅
The mark on the container shows that it's content is vicious.
| 凵 凶 㐅 |
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convex, to stick out, protrude
tū
Pictograph of a protruding object
| 凵 |
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concave, hollow, a depression, indentation
āo
(compare with convex 凸)
Pictograph for concave
| 凵 |
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to bore a hole, to chisel or dig, certain
záo|zuò
Top: business, occupation 业 (it's shown a volcanic vent with a hollow peak), bottom: container 凵 with Yen ¥
A hollow container is cut with a drilling bit, when: boring a hole.
| 业 凵 |
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envelope, case, letter
hán
Image of an envelope: 乛, 凵 and variant of water 水
The 'frame', closed with water, is an envelope.
| 乛 水 凵 |
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