1 criminal

2 penal

1 to break (e.g. stick or bone)

2 a loss

1 to torment

2 to torture

1 to toss from side to side (e.g. sleeplessly)

2 to repeat sth over and over again

3 to torment sb

4 to play crazy

5 to squander (time, money)

1 setback

2 reverse

3 check

4 defeat

5 frustration

6 disappointment

7 to frustrate

8 to discourage

9 to set sb back

10 to blunt

11 to subdue

1 to split sth into two (idiom)

1 a blade will get rusty if it is not sharpened; a man will fall behind if he doesn't study (idiom)

1 lit. cutting and polishing (idiom)

2 fig. to learn by exchanging ideas or experiences

1 lit. to kill the donkey when the grinding is done (idiom)

2 to get rid of sb once he has ceased to be useful

1 If you work at it hard enough, you can grind an iron bar into a needle.

2 cf idiom 磨杵成針|磨杵成针, to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult task

3 to study diligently