be no quarter given

To have no mercy, concession, or indulgence offered. We are at war with barbarians, soldier. There will be no quarter given if you are taken captive, and you shall give them no quarter should you capture them. The match would determine which team made it to the finals of the tournament, so there was no quarter given by either side. Our project must meet the industry's exacting standards—there will be no quarter given on this.