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Douglas Harper's Etymology Dictionary
self-deprecation

1843, from self- + deprecation.

Wiktionary
self-deprecation

n. The disparagement of one's own abilities

Wikipedia
Self-deprecation

Self-deprecation is the act of reprimanding oneself by belittling, undervaluing, or disparaging oneself, or being excessively modest. It can be used in humor and tension release.

Usage examples of "self-deprecation".

To erase that self-deprecation, to make amends for his own maladroitness, F'nor leaned across the table to kiss her on the lips.