Goals by Callum Wilson and Jordan Ibe earned Bournemouth their first ever win over Arsenal and a valuable three points after the Cherries fought back to win 2-1 at the Vitality Stadium on Sunday afternoon.
Both sides looked less threatening in the first half of the tie as they headed into half time 0-0.
Alexis Sanchez's omission from the matchday squad had sparked rumours of an impending move to Manchester United and Arsene Wenger admitted as much in his pre-match press conference as the Chilean winger inched toward the end of a six-month-long saga.
But after Arsenal's opener Bournemouth mounted pressure and nearly restored parity through Ibe who fired a tame shot which was saved by Petr Cech. Referee Kevin Friend had a brilliant view but turned down strong appeals from those in red and black.
A second successive strike by Arsenal fullback Hector Bellerin in as many games put arsenal gave the London side the advantage. Bellerin ran onto an excellently weighted pass from Alex Iwobi to steer the ball into the Bournemouth net.
With 20 minutes remaining Bournemouth found a deserved equaliser.
First Wilson converted Ryan Fraser's teasing cross to restore parity in the 70th minute before Ibe fired home a second having been teed up by the scorer of Bournemouth's first.
The victory moved AFC Bournemouth from 17th to 13th in the Premier League, four points above the drop zone. Knocked out in the FA Cup third round, out of the top four in the league, and their best player in Sanchez leaving - Wenger has a massive job on his hand if he is to somehow rescue something from this season.
Arsenal are now winless in five games in all competitions and five points adrift of fourth place in the Premier League table, prompting a disgruntled reaction from Wenger.