undermine

US /ˌʌndərˈmaɪn/

UK /ˌʌndəˈmaɪn/

B2TOEIC
v.t.Transitive VerbTo weaken or destroy secretly and usually slowly
Too much stress may undermine your health
v.t.Transitive VerbTo excavate the foundation or supporting material of (a building, cliff, etc.).
The soldiers tried to undermine the castle walls by digging a tunnel.

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