Sentence:  One particularly damaging, but often ignored, effect of <WSD>conflict</WSD> on education is the proliferation of attacks on schools...as children, teachers or school buildings become the targets of attacks. Parents fear sending their children to school. Girls are particularly vulnerable to sexual violence. 
Meaning of the word marked with <WSD> tags:  <span id="N1">A clash or disagreement,</span> often violent, between two or more opposing groups or individuals.