What is the meaning of the English word
to make the tune of a song using your mouth, without singing the words
See STORY example: I hummed a happy little song to him.
He began the lip exercises. He stretched his lower lip over his upper lip, then his upper lip down over the lower one. He alternated with increasing speed. He hummed while he did it.
Note: Many vocabulary words have more than one definition. The definition shown here is for the online course below.