Used to express that someone's action had no serious adverse consequences.

(ethics, medicine) To perform no actions which will be injurious or in any way unfavorable to another person, regardless of whether one does anything of positive benefit for that other person.

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

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

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

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

A village and civil parish in North Kesteven district, Lincolnshire, England (OS grid ref SK9762).