The phrase "diluted down" is correct and commonly used in written English.
It typically means to weaken or reduce the concentration of something. Example: The lemonade was too strong, so I diluted it down with more water. The company's profits were diluted down by the increasing competition in the market. I diluted down the cleaning solution before using it on the delicate fabric.
"I found that the Tata stake had become diluted down to single figures.
The second it becomes involved with politics, it becomes diluted down and the pure vision of the customer is lost".
Genomic DNA from different strains was isolated using the YeaStar Genomic DNA kit (Zymo) and the resulting preps were diluted down to a concentration of 5 ng μl−1.
We're going to be diluted down to nothing".
A small volume of dispersion was diluted down to approximately 1 mg/ml with isopropyl alcohol.
So, your Series A investor got diluted down 20%, taking their original 20% stake, down to a 16% stake.
Note: for more precisely diluting down to taste, you can purchase a spirit hydrometer, a device like a small floating thermometer or fishing bobber, which tells you the proof or percentage of alcohol in a solution, for as little as $7 to $10 at most brewing or winemaking supply stores.
Dye solution was prepared by solubilizing 50 µg of dye (one vial) in 5 µl of a detergent P-3000MPP; 20% Pluronic acid, Invitrogen - Life Technologies), and then diluting down to 1 µg/µl by adding 45 µl of CB.
A tradition of "promoters"—as individuals or families with controlling stakes are known can lead firms to borrow rather than dilute down their masters' stakes by issuing shares.
And then, the rest went to the bondholders, people who own debt, not equity, who own debt in GM, got the remaining share, and they also got warrants, which are options to buy more shares, which will dilute down the U.S. and Canada and UAW shares.
We need to get transworld sport back on channel 4 on a saturday morning, so we can all get a taste of some of the other things on offer out there to dilute down the relentless diet of football, and of course get more high profile women's sport shown on TV a lot more.
