n.1610s (n.), "gutter," from water (n.1) + board (n.1). Waterboarding as the name of a type of torture is from 2005, but the practice is older. if (window.googletag) {googletag.cmd.push(function() { googletag.display('dcomMobileSERPDisplayTopAd-300x250'); });} else {console.error('googletag not defined, dcomMobileSERPDisplayTopAd-300x250');}