1) English phrase 
`Dutch courage` or `liquid courage` (cf potvaliancy) refers to courage gained from intoxication with alcohol. It may also be used as a synonym for gin.{cn|date=July 2014} The popular story dates the etymology of the term to English soldiers fighting in the Thirty Years` War. One version states that Dutch gin was used by English soldiers for i...
Dutch courage is slang for the courage of partial intoxication.
[n] - courage resulting from intoxication
It’s generally accepted, or at least the gin folklore states, that the term ‘Dutch Courage’ came about during the Eight Years’ War, the Dutch War of Independence (1568–1648). English soldiers who were there to support the Dutch fight against Philip II of Spain, took a liking to the local Dutch drink jenever, a juniper flavoured spirit and...
noun courage resulting from intoxication
courage inspired by drunkenness or drinking liquor.