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 lip muscles would involuntarily contract causing twitching of lips. Lip twitching is not a matter of concern but it is embarrassing and disturbing for the concerned person. Direct stimulation of muscles, injury or irritation can cause lip twitching. Stress is the main factor attributed to twitching of lips.