This is the 11598th most frequent Turkish word.
fakirleşeceğini
"Fakirleşeceğini" means "that (he/she/it) will become poorer."
Here, 'fakirleşeceğini' indicates a future state of becoming poorer due to not saving money.
Eğer tasarruf etmezsen, fakirleşeceğini unutma.
If you don't save money, don't forget that you will become poorer.
In this sentence, 'fakirleşeceğini' refers to the anticipated outcome of the ongoing economic crisis.
Bu ekonomik krizle herkes fakirleşeceğini düşünüyor.
With this economic crisis, everyone thinks they will become poorer.
This usage of 'fakirleşeceğini' suggests the predictable result of maintaining luxury habits.