Definitions

1. verb

to fasten (a button) again after it has been undone

“She had to rebutton her shirt after spilling soup on it.”

2. noun

the act of fastening a button that has been undone

“The rebuttoning of the coat was a time-consuming task.”

3. verb

to reattach a button that has come loose

“He had to rebutton the loose button on his jeans.”