The whistle_(object) tag seems redundant if it's already stated on the wiki that whistle refers to the object. So why we have 2 tags for that? Am I missing something?

Whistle should be disambiguated, since someone can conceivably use it to refer to the action (which may or may not involve the object).

watsit said:
Whistle should be disambiguated, since someone can conceivably use it to refer to the action (which may or may not involve the object).

We do have a tag for the action:
(　･ω･)☞⠀⠀ whistling

lockay said:
We do have a tag for the action:
(　･ω･)☞⠀⠀ whistling

And the whistle tag can very easily be used by mistake to mean that, which is why it should be disambiguated to tell people to use whistle_(object) or whistling depending on what they meant.

watsit said:
And the whistle tag can very easily be used by mistake to mean that, which is why it should be disambiguated to tell people to use whistle_(object) or whistling depending on what they meant.

Now I understand better, thanks for explaining! (^-⠀^
I also think we should move it to disambiguation.