Usually used in response to someone’s apology to indicate acceptance.
See No worries.
Sorry I insulted you earlier. I didn’t mean for it to come out that way.
Response: no harm no foul buddy.
It’s used commonly today to brush off insults or mistakes and the like.
Doughlas:Hey man, no harm no foul.
In the eyes of some, soft fouls being called only slow the game and detract from the contest and beleive that unless the contact is significant there is no point in calling the foul. Hence, No harm, no foul.
Player A: ‘you fouled me’
Player B: ‘come on man, no harm no foul’
Referee blows whistle for soft hands foul
Player: ‘come on man, no harm no foul’