To develop a rhythm/become good at something. Can be used to describe a physical or mental activity.
The logical source of this expression is from the pendulum of a clock which swings evenly and repetively. One early use was by Thomas Huxley who used the expression in Life and Letters, written in 1864.
Judge rules unused Borders gift cards to be worthless(May 23 2013) Borders owes nothing to holders of roughly $210.5 million of gift cards that had not been used by the time the bookstore chain shut down, a Manhattan federal...