Spitting at an opponent is regarded as one of the most taboo actions in football.
While players can on occasion lose their cool and swing a fist or an elbow at an opponent, this is not regarded with the same disdain the act of spitting on a fellow professional is.
Seen as a show of gross disrespect, it is considered one of the lowest actions possible on the park.
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Nevertheless, over the years there have been numerous high-profile incidents in which players have been caught aiming their phlegm at others, with the increased television coverage over the years making it more and more difficult for players to escape scrutiny for such moments.