The series of bodily changes that occur in the female of most mammals from one period of estrus to another. The estrous cycle usually takes place during a specific period known as the breeding season, which ensures that the young are born at a time when the chance of survival is greatest.
ear-to-ear. It's about smiling. Ear-to-ear smile or grin is when you have a very broad and generous smile. Such a smile when each corner of your mouth is by each of your ears. Explain to me why you don't have an ear-to-ear grin right now.
talk someone's ear off. Fig. to talk to someone endlessly; to bore someone with too much talk. My aunt always talks my ear off when she comes to visit. Stay away from Mr. Jones. He will talk your ear off if he gets a chance. See also: ear, off, talk.