become less in amount or intensity; "The storm abated"; "The rain let up after a few hours"
{f} become less extreme or slower (e.g. "It's been snowing so hard for a long time. Will it ever let up?")
reduce pressure or intensity; "he eased off the gas pedal and the car slowed down"
If an unpleasant, continuous process lets up, it stops or becomes less intense. The rain had let up. see also let-up
If there is no let-up in something, usually something unpleasant, there is no reduction in the intensity of it. There was no let-up in the battle on the money markets yesterday. when something unpleasant stops or becomes less difficult, severe etc no let-up/not any let-up
[ 'let ] (transitive verb.) before 12th century. Middle English letten, from Old English lettan to delay, hinder; akin to Old High German lezzen to delay, hurt, Old English l[AE]t late.