• 舌先したさき — tip of the tongue
• 舌戦ぜっせん — war of words / heated debate
• 毒舌どくぜつ — sharp tongue / sarcastic speech
• 舌鼓したつづみ — smacking lips (in enjoyment)
• 饒舌じょうぜつ — talkativeness / loquacity

This kanji is a pictograph of a tongue sticking out from the mouth. It covers literal and metaphorical senses — from the physical organ to eloquence, speech, and argument.