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In page Tackle (football move):

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Tackles that involve lunging at an opponent with both legs, regardless of whether the ball is won, are generally considered to constitute serious foul play and hence result in a sending-off.[citation needed] This explicitly includes "scissoring"[citation needed][3] (tackling with legs apart, so as to trap the opponent's leg or legs in between), which is likely to be punished with a sending-off (red card), as it poses a high risk of severe knee injury to the player being tackled. Tackling with studs up is considered dangerous.[4] A studs up tackle is made when a player lunges into a tackle with a leg or both legs outstretched exposing the soles of their boots. Referees are encouraged to at the very least caution (yellow card) players who commit such challenges.[5]