mishandle

Etymology

From mis- + handle.

verb

1. (transitive) To manipulate something roughly, causing physical damage.
   If you mishandle a fragile package, the contents may break.
2. (transitive) To deal with a situation incorrectly or ineffectively; to make a mistake in handling a situation.
   The prime minister was accused of mishandling the diplomatic crisis.

noun

1. Rough manipulation which causes physical damage.
2. Ineffective or incorrect deal.
3. Improper, wrong, or bad usage or treatment; abuse.