除去する、予防する、不要にする
1.to anticipate and prevent or eliminate (difficulties, disadvantages, etc.) by effective measures; render unnecessary: to obviate the risk of serious injury.
Citations forobviate
Well, sir, to obviate the inquiries which would inevitably be set on foot, should Mr Fink-Nottle not present himself at Deverill Hall this evening, it would appear to be essential that a substitute, purporting to be Mr Fink-Nottle, should take his place.