Let down and Left in the lurch

Let down verb - To fall short in satisfying the expectation or hope of.

Left in the lurch and let down are semantically related In some cases you can replace phrase "Left in the lurch" with "Let down", this terms are similar.

Let down and left in the lurch are semantically related in abandon topic. Sometimes you can use "Let down" instead a verb phrase "Left in the lurch".