spare someone's blushes
US /sper ˈsʌm.wʌnz ˈblʌʃ.ɪz/
UK /sper ˈsʌm.wʌnz ˈblʌʃ.ɪz/
1.
to avoid embarrassing someone or making them feel ashamed
:
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I decided not to mention his mistake, to spare his blushes.
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The teacher changed the subject to spare the student's blushes after he gave a wrong answer.