akin to rhegnumi, "to break," denotes "a cleavage, fracture" (so in the Sept., e.g., 1 Kings 11:30,31 ); by metonymy, that which is broken, "a ruin," Luke 6:49 .
the neuter plural, perfect participle, Passive, of katastrepho, "to overturn," is translated "ruins" in Acts 15:16; cp. DIG, No. 3. See OVERTHROW.