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undermine

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verb [transitive] American English pronunciation: undermine /ˌʌndərˈmaɪn/ 
Word Forms
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present tense
I/you/we/theyundermine
he/she/itundermines
present participleundermining
past tenseundermined
past participleundermined
  1. 1
    to make something or someone become gradually less effective, confident, or successful

    Britain was accused of undermining international efforts to reduce pollution.

    Their trading position has been seriously undermined by the minister's remarks.

    1. a.
      to deliberately say or do things that make someone appear less impressive or less important

      They had spoken secretly to reporters in an effort to undermine the leadership.

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