To utter a low, usually nasal, complaining cry or sound, as from uneasiness, discontent, peevishness,etc.: (Dictionary.com)
To snivel or complain in a peevish, self-pitying way: (Dictionary.com)
To make a long, high, sad sound. (Cambridge Dictionary)
If you whine, especially as a child, you complain or express disappointment or unhappiness repeatedly. (Cambridge Dictionary)
A long, high-pitched complaining cry. (Oxford Dictionaries)
A long, high-pitched unpleasant sound. (Oxford Dictionaries)
A complaining tone of voice. (Oxford Dictionaries)
A feeble or petulant complaint. (Oxford Dictionaries)
To utter a high-pitched plaintive or distressed cry. (Merriam – Webster)
Whine, Whine, Go Away: Tips for Dealing with Whining.
Why is my dog whining?