Also see definition of "Against" in Word Study
Study Dictionary
Against
AGAINST [ISBE]
AGAINST - a-genst' (kata; enantion; pros): Preposition expressing contrast. When used of direction, equivalent to "toward" (Mt 10:35; 12:14, etc.); when of position, meaning "opposite," "facing," "in front of" (1 Ki 7:5; Gen 15:10, Rom 8:31); when of action, "opposed to" (Mt 5:11; 26:59; 1 Cor 4:6); "in resistance to" (Heb 12:4); "provision for" (Greek eis, literally, "unto, toward" (1 Tim 6:19). Sometimes also applied to what breaks an established order as "customs" (Acts 28:17), "nature" (Rom 1:26). Peculiar shades of meaning may be traced by careful examination of the variety of prepositions in Hebrew and Greek employed in the Scriptures, that are translated into English by this one word.H. E. Jacobs
Also see definition of "Against" in Word Study