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Synonyms
coun·ter·vail (kouńtər-vāĺ, kouńtər-vāĺ)

[Middle English countrevaillen, from Old French contrevaloir, contrevail-, contre-, counter-, + valoir, to be worth (from Latin valēre, to be strong; see wal-).]

verb: -vailed, -vail·ing, -vails. 

transitive verb 

  1. To act against with equal force; counteract.
  2. To compensate for; offset.

intransitive verb 

To act against an often detrimental influence or power.