set against (?.)

• aggravate
• alienate
• antagonize
• come between
• disaffect
• disunite
• divide
• embitter
• envenom
• estrange
• exacerbate
• fan the flame
• heat up
• infuriate
• irritate
• light the fuse
• madden
• make trouble
• pit against
• provoke
• separate
• set at odds
• set at variance
• set on
• sic on
• sow dissension
• stir up trouble