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Abut against vs Abut on

Abut against somethingrest against the end part of something firmly.

  • The posterior extrascapulars also abut anteriorly against this median bone, but without touching each other, so that the commissure does not cross the midline.

Abut on something—(of a plot of land, etc.) border on something; lie next to something.

  • Mexico abuts on some of the richest parts of the United States.