出
JLPT HSK 1

chū
Two mountains 山 behind each other (traditionally "sent behind the mountains" for exile)
Behind a mountain another comes out.

	击
JLPT HSK 5

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.

	齿
JLPT HSK 5

chǐ
Top: to stop 止 (here: nose), bottom: open mouth 凵 with teeth 人
Below the nose is an open mouth with teeth.

	涵
JLPT HSK 6

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.

	凶
JLPT HSK 6

xiōng
Container 凵 with a mark 㐅
The mark on the container shows that it's content is vicious.

	凸
JLPT HSK 6

tū

Pictograph of a protruding object

	凹
JLPT HSK 6

āo
(compare with convex 凸)
Pictograph for concave

	凿
JLPT no HSK

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.

	函
JLPT no HSK

hán
Image of an envelope: 乛, 凵 and variant of water 水
The 'frame', closed with water, is an envelope.