vitiate VISH-ee-ayt, transitive verb:
- To make faulty or imperfect; to render defective; to impair; as, "exaggeration vitiates a style of writing."
- To corrupt morally; to debase.
- To render ineffective; as, "fraud vitiates a contract."
The o-line's inability to protect JP or provide blocking for the running game vitiated any chance for offensive production last season.