One of the mysteries of the English language finally explained.
British. Originally: a guard deployed along the shoreline to prevent smuggling or other contravention of customs regulations. Later (usually with capital initial): a division of the Customs and Excise department, mainly responsible for the collection of customs and excise revenue from those arriving in the United Kingdom by sea or (later) by air; a member of this division (now historical). Compare "coast-guard". Now historical.
Mid 17th century; earliest use found in Original Journals of the House of Commons. From water + guard.
In this article we explore how to impress employers with a spot-on CV.