There are a few word omitted after "might" here. ( f u6 Q3 Y2 A* z, P8 A 5 {6 L: W2 s* [: h: qImitate means "mimic", as mischievous school might (mimic) a teacher behind his/her back. + B/ I8 u# C' o5 O( o0 u5 s3 X% U0 Y1 e
I would say such usage is rather common. . z6 ^- e# x: P+ C. n0 D " Z+ r$ v) O8 |8 Q% uPan.