sharpener

noun3

1. •
   A device for making things sharp.

   • There was a pencil sharpener at the front of the classroom.
2. •
   (figurative) That which makes something sharp.

   • “Sir,” said the shepherd, “poverty is a great sharpener of the wits. […] — 1795
3. •
   (informal) An alcoholic drink taken at the start of the day, or just before a meal.

   • The summery G&T somehow loses its clink-clink-fizz perfection as an after-work sharpener and just seems to rub our noses in the dank gloom ahead. — 2015