Dutch courage strength or confidence gained from drinking alcohol; the term is recorded from the early 19th century, and referred to the belief that the Dutch were heavy drinkers.
Dutch uncle a person giving firm but benevolent advice; the expression is recorded from the mid 19th century, and may imply only that the person concerned is not an actual relative.
Dutch wife a bolster used for resting the legs in bed. The expression is recorded from the late 19th century, and is an extended use of an earlier term to describe a rattan open frame used in the Dutch Indies to support the limbs in bed.
See also beat the Dutch, double Dutch.