The word up may be the most versatile two-letter combination in the English language. While up may appear as a noun, a verb or an adjective, its most common uses are as an adverb or a preposition. Remember this axiom: Adverbs are mobile, and prepositions are not.
Here’s why: As a preposition, up is immovable; in the sentence ”We climbed up the corporate ladder,” up cannot logically be moved to any other place in the sentence. In that case, the preposition-up combination is a unit, and you can’t split it up.
Now consider this sentence, which features a verb-adverb combination: “We looked up the information.” In that case, up can be moved, as in “We looked the information up.” Because up functions as an adverb, you can move it away from the verb.
Following is a partial list…
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