Undermine
/ˈʌndəˌrmaɪn/
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Definition
(verb) To dig underneath (something), to make a passage for destructive or military purposes; to sap.
Sentence Examples
Many fear that cuts in the defense budget will undermine the military's effectiveness.
The market tends to undermine the very values that gave rise to it.
CEFR Practice Quiz
The constant criticism began to ____ his confidence and his ability to finish the project on time today.