Phrase of the day with an explanation of it's origin
Today's phrase is a phrasal verb with a sports origin.
To keep it up
To persevere at a task and to continue in the same way.
In Victorian times playing badminton was very popular in the summer in the garden. The shuttlecock needs to be kept up in the air at all times and so the phrase "keep it up" was shouted to encourage the players to continue a rally.