let-up• There can be no let-up in the war against drugs.• There's going to be no let-up, you know.• There was to be no let-up for more than three months.• On past form he need fear no let-up in the fight.• At peaktimes there is no let-up with an endlessstring of calls back-to-back.• The second periodsaw no let-up from either side with both still determined to play 15-man rugby.