n.
1.an event in which one thing is substituted for another
2.the act of furnishing an equivalent person or thing in the place of another
3.someone who takes the place of another person
4.a person or thing that takes or can take the place of another
5.filling again by supplying what has been used up
6.a person who follows next in order
Idiom of the Day
skip rope
to jump over a rope that is held by two people and which goes over your head and under your feet
The children spent the morning skipping rope.