try out on

try (something) out on (someone)

To test something on someone else, in order to get their feedback on it. These cookies should be a big hit at the bake sale—I tried them out on my kids, and they gobbled them right up! Try your proposal out on me, and I'll tell how good or bad it sounds.
See also: on, out, try

try something out on someone

to see how someone responds to something or some idea. Let me try this idea out on you and see what you think. Let me try out this new medicine on her.
See also: on, out, try