noun

1. harm, damage, or injury, esp. that done by a person
2. a cause or source of harm, damage, or annoyance; specif.,
   1. action or conduct that causes damage or trouble
   2. a person causing damage or annoyance
3. a tendency or disposition to annoy or vex with playful tricks
4. 1. a troublesome or annoying act; prank; playful, vexing trick
   2. playful, harmless teasing

Etymology: ME meschief < OFr < meschever, to come to grief < mes- (see mis-) + chever, come to a head < chief, end, head (see chief)