let down

verb lets down · letting down · let down

1. idiomatic, transitive To disappoint; to betray or fail somebody. I promised him I would meet him there, and I will not let him down.

   Similar: cross up, dingo, sell out, stab in the back, assfuck, betray, burn, cop out, cross out, double-cross, do someone dirty, do the dirty on · Opposite: come through, keep faith, abide by, hold on, go to the wall for someone, stand by, stick by, stick with

2. transitive To lengthen by undoing and resewing a hem.

   Opposite: take in

3. intransitive To reduce one's level of effort.
4. To soften in tempering. to let down tools or cutlery
5. To thin; to reduce the thickness or viscosity of. let the sauce down with a little pasta water if it starts to become too thick; if the soup is too thick, you can let it down with a little milk; let the sauce down with a dash of the pickling liquor; use some of the stock to let down the onion sauce
6. Used other than figuratively or idiomatically: see let, down: especially, to allow to descend. let down your hair

   Opposite: put up