shotgun marriage(redirected from shotgun marriages)
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A marriage that happens quickly due to an unplanned pregnancy. We knew it was a shotgun marriage when Frank's new wife had a baby five months after the wedding.
a ˌshotgun ˈwedding/ˈmarriage(old-fashioned, informal) a marriage which takes place because the woman is pregnant
This expression probably refers to the father of a woman, who threatens to shoot the man unless he marries her.