働かせる
1
to put someone to work;to make someone work
See also:
働かす (はたらかす)
課長は私を奴隷のように働かせた。
The section chief made me work like a slave.
2
to use;to apply;to exert;to exercise (restraint, one's imagination, one's brain, etc.)
想像力を働かせた。
I used my imagination.