Splash out is an informal term we use when we mean that someone spends an extravagant sum of money on something. It can be used alone, such as in this case:
- We splashed out last night and went to a very expensive restaurant.
- Can she afford to splash out a little? Is her budget unlimited?
If we translated “splashed out” into Spanish, we would say something like “ Tiramos la casa por la ventana” o “Gastamos a manos llenas…”
We can also mention the item or luxury we spend our money on. In that case, we will use “splash out on something”
- They have just splashed out on a luxury holiday.
- He wanted to splash out on a new car but as he has just bought a new house, he cannot.