you're it

You now have a particular role in something. It is most often associated with the children's game "tag," wherein the phrase indicates who will be pursuing the others to tag them. A: "Tag, you're it!" B: "Aw, man!" We need a new leader in this department, and you're it.

See also:

(as) sure as eggs (is eggs)
chain reaction
reaction
beck and call
let a thousand flowers bloom
a penny for them
rest in peace
eggs is eggs
great minds
great minds think alike

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