Thursday Morning Riddle

I’m the notes on the page; I am wedged in the door;
I’m the lights on the stage; I can tread on the floor;
I am paying the bill; I’m put down when at war;
I am three in the yard; but in these lines, I’m four.

Who am I?

UPDATE: Riddle solved by Rebecca. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Rebecca Says:

    Foot!

  2. Bill Says:

    FOOT is correct. Way to go, Rebecca!

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