Meanings of begin unbuttoning in English

Slowly, without looking at him, I begin unbuttoning my boots.

It need not be so. He rotated her hands, palms up, so he could begin unbuttoning her gloves.

He began unbuttoning it and pulling it over his head.

Then he began unbuttoning and turning back his sleeves.

"Good," Greta said, and began unbuttoning her blouse.

A strip-tease song started playing on the big speakers throughout the auditorium, and the audience was mute with wonder as William began unbuttoning his shirt.