(law) legal principle under which the state should only limit an individual's actions to the extent that they would cause harm to another

(public health) A range of public health policies designed to lessen the negative social or physical consequences associated with various human behaviors, both legal and illegal.

(UK) Serious physical injury to a person, or the fact of causing such injury.

(Britain, law) Hurt or injury which interferes with the health or comfort of the victim and which is more than transient or trifling.

plural of number needed to harm

The number of people, statistically, who must be exposed to something in order for one of them to experience an adverse effect.

Synonym of wouldn't hurt a fly

(law) repeated actual bodily harm

To make a situation worse, usually while trying to make it better.