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
lay one's cards on the table
to let someone know one`s position and feelings openly, to deal honestly with something
The employee decided to lay his cards on the table and tell his boss about the job offer from the other company.