1 to elaborate (on a theme)

2 to expound (the classics)

3 perfunctory

4 to skimp

5 to botch

6 to do sth half-heartedly or just for show

7 barely enough to get by

1 to multiply

2 to reproduce

3 to increase gradually in number or quantity

1 to give rise to

2 to derive

3 derivative

4 derivation

1 a derivative (complex product derived from simpler source material)

1 Xia Yan (1900-1995), Chinese writer, playwright, socialist critic and movie pioneer

1 Descendants are great in numbers. (idiom)