Meanings (ES + gloss)
ahondar
To lose firmness, elasticity, vigor, or a thriving state; to sink; to droop; to flag; to bend; to yield, as the mind or spirits, under the pressure of care, trouble, doubt, or the like; to be unsettled or unbalanced.
The mind I sway by, and the heart I bear, / Shall never sag with doubt nor shake with fear.