What is the true definition of Kahu?

A while back the internet exploded with a lot of Instagram and Facebook posts sharing the Hawaiian term "kahu." The definition is said to describe the relationship of a human to their pet and is summed up as something like this in most posts:

“In Hawaiian, you don’t call yourself your pet’s owner. You are their Kahu (ka – hoo). Kahu has many meanings: Guardian, protector, steward, beloved, and attendant. Someone entrusted. With the safekeeping of something precious, something cherished.“

I searched through several posts but could not find anyone who was of Hawaiian descent verifying that this definition is correct and is used in this way to describe relationship to one's pet. Could anyone verify or provide a correction? Thank you