"lavish on" is correct and usable in written English.
You can use it to describe when someone spends a lot of money on something. For example, "My aunt was always willing to lavish on her grandkids."
They do not overspend; and if they are too lavish on one item they must be stricter on another.
Live lavish on less at one of these three restaurants with half-priced dining.
There is really no end to the amount of attention that one should lavish on the bathroom".
The British, ignorant and condescending where Ireland is concerned, rarely devote a fraction of the interest to Irish contests that they lavish on far less relevant US ones.
No one speaks of it with the flushed admiration they might lavish on, say, "The Sound of Music".
"The love and affection they lavish on their boots!
Hence all the attention governments lavish on them.
Across the country, cities and states routinely lavish on companies what economists call "location-based incentives".
Her pregnancy has received the kind of attention television might lavish on a royal birth.
Also, the Russians always lavish on this ballet their famously corny acting.
THE attention women now lavish on pocketbooks once went to softer forms of persuasion.
