blindside

English Thesaurus

1. attack or hit on or from the side where the attacked person's view is obstructed (verb.competition)

hypernym	:	assail, assault, attack, set on,
definition	:	attack someone physically or emotionally (verb.competition)

2. catch unawares, especially with harmful consequences (verb.social)

hypernym	:	surprise,
definition	:	come upon or take unawares (verb.social)