n.
1.something clearly established
2.property that your creditor can claim in case you default on your obligation
3.a prisoner who is held by one party to insure that another party will meet specified terms
4.one who provides a warrant or guarantee to another
5.a guarantee that an obligation will be met
Idiom of the Day
turn on (something)
to open or start something, to let water or electricity flow
"Please turn on the radio so we can hear the evening news."