Aterriza

aterrizar - (verb) to come back to reality, to stop dreaming.

I learned this one from my mother-in-law. If you're acting like you've got your "head in the clouds", one might say aterriza!, or "come back down to earth". I would guess the root of the word is derived from the Latin terra, which directly translates to "earth". I hope I don't hear this one too much from my mother-in-law... or my wife for that matter.

[wiktionary]