"To give no quarter" means to show no mercy or grant no leniency in a situation, especially in a conflict or battle. It implies being ruthless and not giving any advantages or concessions to the other side. Full definition
For some customers, this would mean planning their spending during given quarters in order to optimize their rewards. (thedigeratilife.com)
If not, cook for 2 to 3 minutes before giving them a quarter turn. (fieryfoodscentral.com)
Big publishers who gave me a quarter - million bucks in advance for a couple of books that barely made it off the runway before crashing and burning. (caridad.com)