Answer:
Other terms for this handy device include doohicky, dooΒ-dad, and whatchyamacallit.
The more you take away, the bigger it gets.
If you agree give me one of these.
What falls down but is never injured?
Handy when you need to measure something or run a kingdom.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?