v.
Pronunciation: ˌ ə n-d ə r- ' m ī n
Function: transitive verb
Date: 14th century
1 : to excavate the earth beneath : form a mine under : SAP
2 : to wash away supporting material from under
3 : to subvert or weaken insidiously or secretly <trying to undermine his political rivals>
4 : to weaken or ruin by degrees
synonyms see WEAKEN