There are a few word omitted after "might" here. " k `. _6 z+ [$ @# x( n7 C& y! O# x$ X
Imitate means "mimic", as mischievous school might (mimic) a teacher behind his/her back. * M; P' M# k9 Y" W+ Z$ \5 ^* m: m" N. I6 V7 ]; U- f4 G
I would say such usage is rather common. % S' w# C9 v! J8 Z
1 C. O- w" M# w7 }: m4 t# f2 B* e
Pan.