To press something, especially a mixture for making bread, firmly and repeatedly with the hands and fingers. (Cambridge Dictionary)
When you knead dough or other food, you press and squeeze it with your hands so that it becomes smooth and ready to cook. (Collins Dictionary)
If you knead a part of someone’s body, you press or squeeze it with your fingers. (Collins Dictionary)
Work (moistened flour or clay) into dough or paste with the hands. (Oxford Dictionaries)
Make (bread or pottery) by kneading flour or clay. (Oxford Dictionaries)
Recipe tips. Knead.
How to knead clay.