Wiktionary
vb. (present participle of button up English)
Usage examples of "buttoning up".
Grave Digger and Coffin Ed were buttoning up their coats when the telephone rang in the captain's office.
Davout brightened up at the news the adjutant brought, and began buttoning up his uniform.
As he was buttoning up his shirt he looked at the time on the clock on the table, then went back to looking for the spurs under the bed.
He finished buttoning up his pants and stomped into his boots, then snagged his gunbelt from the back of the chair next to the bed where he had hung it.
He finished buttoning up the ragged shirt stolen from the mugger the night before, watching the boy by the door.
But I guess it'll just be a question of buttoning up again as fast as we can.
He began buttoning up his shirt, the fingers of his left hand fumbling awkwardly.