servile adjective. âº âeager to âserve and âplease someone âelse in a way that âshows a âlack of ârespect for yourself: As a âwaiter, you âwant to be âpleasant to âpeople without âappearing servile. (Definition of servile from the Cambridge Academic Content Dictionary Â© Cambridge University Press).
That is a good question. In fact, it is not really known why horse yawn. Some suggestions for this behavior are the following: 1  Change of sleeping, napping and waking state. 2  Physical fatigue. 3  Mental stress.  Release of mental or physical stress. Horses will often yawn after a chiropractor session or massage session.
HIV can cause changes in the brain that increase the risk of behavior changes. Yawning excessively may also occur in the presence of a heart defect or disease. The vagus nerve acting on blood vessels can stimulate excessive yawning. This is called a vasovagal reaction and may be an indicator that you have a heart problem.