Definition of up:

part of speech: interjection

Arise; raise up.

part of speech: preposition

From a lower place or position to a higher; not down.

part of speech: adverb

Aloft; on high; in a state of advance; in a state of being raised or increased; in a state of climbing or ascending; in a state of insurrection; in a state of elevation; out of bed; into order, as he drew up his company; much used in modifying the action of a verb.

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The upright pillar round which the steps turn in a winding staircase, and by which they are supported from the bottom to the top. ...