Simple past tense and past participle of button up.
Buttoned-up Sentence Examples
They buttoned up and wouldn't reveal beans.
The officers buttoned up their coats, buckled on their swords and pouches, and moved along the ranks shouting.
Berg, closely buttoned up in his new uniform, sat beside his wife explaining to her that one always could and should be acquainted with people above one, because only then does one get satisfaction from acquaintances.
Pierre was there too, buttoned up since early morning in a nobleman's uniform that had become too tight for him.
But her neat, buttoned-up life starts to unravel when her daughter Elena returns home, angry and unemployed.