ward_off
1. [ verb ] prevent the occurrence of; prevent from happening
Synonyms: avoid avert head_off stave_off obviate fend_off deflect debar
Examples:

"Let's avoid a confrontation" "head off a confrontation" "avert a strike"

Related terms: prevent obviation
2. [ verb ] avert, turn away, or repel
Examples:

"Ward off danger"

Related terms: defend