wobble, piggy bank, pedagogy

to (cause somethingto) shake or move from side to side
in a way that shows poor balance: [1st lecture on vibrations and waves. you can see some examples of wobbling motion.]
That bookcase wobbles whenever you put anything on it.
Don't wobble the table, please, Dan.
(책상 다리가 맞지 않아 비틀거리는 것 = wobble)
figurative The company's shares wobbled with the news of
a foreign takeover bid.
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piggy bank: 돼지 저금통 

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pedagogy: 교육학
 the study of the methods and activities of teaching
The book describes current pedagogical methods used in teaching reading.(이 책은 책 읽기를 가르치는데 사용되는 최근의 교육학적 방법에 대해 설명하고 있다.)

The reforms are pedagogically questionable.