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warchalk

From Wiktionary, the free dictionary

English

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Etymology

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From war +‎ chalk, modelled on war-dialing.

Verb

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warchalk (third-person singular simple present warchalks, present participle warchalking, simple past and past participle warchalked)

  1. To draw chalk symbols in public places (such as the side of a building or a sidewalk) to show users of computers with Wi-Fi capability where a wireless network may be accessed.