To utter a plaintive cry, as some animals; to moan with a childish noise; to complain, or to tell of sorrow, distress, or the like, in a plaintive, nasal tone; hence, to complain or to beg in a mean, unmanly way; to moan basely
If something or someone whines, they make a long, high-pitched noise, especially one which sounds sad or unpleasant. He could hear her dog barking and whining in the background The engines whined. Whine is also a noun. the whine of air-raid sirens
disapproval If you say that someone is whining, you mean that they are complaining in an annoying way about something unimportant. They come to me to whine about their troubles. children who whine that they are bored `Why can't you tell me?' I whined