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.
Answer by Planetta. Confidence votes 70. Play it by ear refers to a musical sense, as in playing an instrument without the sheet music to read, so you are going to play what you hear, or play it by ear. It is a term signifying that you are going to keep your ears open and produce a result as more information arises.