Up to snuff

Up to snuff means the same thing as being up to scratch, which means that someone or something is sharp, clever or up to the required standard. The expression dates from the 18th century and derives from the erstwhile habit of taking snuff, which was thought to stimulate and sharpen both the mind and senses. The complete expression is ‘up to snuff and a pinch above it’ meaning that someone or something is actually very clever and above the required standard.