Meaning of UP in English
( adv. )
To or in a position of equal advance or equality; not short of, back of, less advanced than, away from, or the like; -- usually followed by to or with; as, to be up to the chin in water; to come up with one's companions; to come up with the enemy; to live up to engagements.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012