Definition of "mark off" [mark off]

• To separate by or as with a boundary line. (verb)
• To indicate as dealt with, as on a list. (verb)

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• "If the Kaiser asked a question, Ludendorff would clap his monocle in his eye, bend over his map, mark off distances … detail the names and numbers of divisions, times of attack and the objective aimed at."
• "One may mark off significant developments in his thought over this twoscore years, but one can hardly miss the fundamental consistency in his entire life's work."
• "Here the trees were all disciplined, lined up in rows to mark off one farmer's field from another."