spare (someone's) blushes
To keep from making someone feel embarrassed or awkward. However, due to your family's great service to the crown, we will spare your blushes and not create a public scandal around this debacle. I tried sparing her blushes when she asked me to prom by saying I had no intention of going with anyone.
spare someone's blushes
or save someone's blushes
BRITISHCOMMON If someone spares your blushes or saves your blushes, they do something that stops you from being in an embarrassing situation. Williams spared Tottenham's blushes last night, scoring a superb goal against Enfield.
spare (or save) someone's blushes
refrain from causing someone embarrassment.