What is the word for doing something to help someone without them knowing?

I can't think of the word. I thought it was Martyr, but that's totally different.
Asked Aug 13, 2014
I cannot think of one word, but you could call it a "Random Act of Kindness". Such acts are usually done without the other person knowing who did them a kindness
Answered Aug 07, 2015
Remain anonymous?
Answered Feb 09, 2016

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