Define "tweak" function

[Ahanu Banerjee]

How can I define a function that applies one or more tweaks to the object that comes after it? 

example: I want the following _expression_ to be a function called "\makeRed":

-\tweak color "red"

so that I can type \makeRed \downbow instead of -\tweak color "red" \downbow

Thanks,

-Ahanu