Historical Examples. 1  What between the blow of the cougar and the force of the fall, the big-horn was dead. 2  Two Arrows wiped the blood of the cougar from the blade of his lance. 3  But now the hounds were too quick, and in a trice they had the cougar surrounded. 4  No cougar stalking its prey could have been more lithely wary.
SeveralPossibilities: Most cases of a twitching lip may be due to stress, fatigue, emotion, excessive caffeine intake or some deficiency in the diet such as potassium. Lip twitching in most cases is self-limiting, disappearing in minutes or maybe in a few days without any residual problems.
The most common causes of lip twitching are 1  : Stress. 2  Fatigue. 3  Severe anxiety.  Emotions, such as anger, amusement, 1  fear. Potassium deficiency.  Excessive stimulant intake â coffee, certain soft drinks, tea, chocolate and over-the-counter (OTC) 1  stimulants. Alcohol withdrawal or 2  abuse. Cigarette or nicotine withdrawal.