IPA: /dɪˈmɑrk/
KK: /dɪˈmɑrk/
To set the boundaries or limits of something, often by marking or drawing a line.
The surveyor will demark the property lines to avoid any disputes.
Past: demarked
Past Participle: demarked
Demark is formed from "de-" (meaning down or away) and "mark" (from Old English "mearc", meaning boundary or limit). The word means to set or define a boundary or limit.
Think of 'marking' a boundary 'down' or 'away' to remember that 'demark' means to set a boundary.