unbutton

/ʌnˈbʌtən/
verb
  1. To open or undo the buttons of a piece of clothing.
    • He asked his daughter to unbutton the top button of her shirt.
    • I had to unbutton my jacket because it was too tight.
    • She began to unbutton her coat as she entered the warm room.
  2. To relax and become less formal or reserved, often after a period of tension or formality.
    • It took him a few minutes to unbutton and tell jokes at the party.
    • The usually quiet professor unbuttoned during the casual dinner and told funny stories.
    • After the meeting, the team finally unbuttoned and shared their real opinions.
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What does "unbutton" mean? | whatsthatwordmean | whatsthatwordmean