Spare somebody’s feelings
Definition 1 of 1
Pro Tip 1/3Emotional Tact
Using the phrase conveys sensitivity towards someone's emotions by avoiding harsh truths. 
She spared his feelings by complimenting his effort, despite the poor result.
Pro Tip 2/3Indirect Communication
Sometimes used to indirectly communicate criticism without being blunt. 
To spare her feelings, he suggested she might try a different approach next time.
Pro Tip 3/3Cultural Sensitivity
In some cultures, it's more common to spare feelings to maintain harmony. 
In a collectivist culture, people often spare someone's feelings to keep group unity.