The adjective is pronounced /rʌn daʊn/. The noun is pronounced /rʌn daʊn/.
also rundown
1.
If someone is run-down , they are tired or slightly ill. ( INFORMAL )
...times when you are feeling tired and run-down.
ADJ : usu v-link ADJ
2.
A run-down building or area is in very poor condition.
...one of the most run-down areas in Scotland.
...a run-down block of flats.
ADJ : usu ADJ n
3.
A run-down place of business is not as active as it used to be or does not have many customers.
...a run-down slate quarry...
ADJ : usu ADJ n
4.
When the run-down of an industry or organization takes place, its size or the amount of work that it does is reduced. ( mainly BRIT )
...the impetus behind the rundown of the coal industry.
N-SING : N of n
5.
If you give someone a run-down of a group of things or a run-down on something, you give them details about it. ( INFORMAL )
Here’s a rundown of the options...
N-SING : usu N of/on n