[let down] {v. phr.}
1. To allow to descend; lower.
* /Harry let the chain saw down on a rope and then climbed down himself./
2. To relax; stop trying so hard; take it easy.
* /The horse let down near the end of the race and lost./* /The team let down in the fourth quarter because they were far ahead./
Compare: LET GO. 3. To fail to do as well as (someone) expected; disappoint.
* /The team felt they had let the coach down./