σωσον verb - aorist active middle - second person singular
sozo  sode'-zo: to save, i.e. deliver or protect -- heal, preserve, save (self), do well, be (make) whole.
σεαυτον reflexive pronoun - second person accusative singular masculine
seautou  seh-ow-too': respectively of (with, to) thyself -- thee, thine own self, (thou) thy(-self).
και conjunction
kai  kahee: and, also, even, so then, too, etc.; often used in connection (or composition) with other particles or small words
καταβα verb - second aorist active middle - second person singular - attic
katabaino  kat-ab-ah'-ee-no: to descend -- come (get, go, step) down, fall (down).
απο preposition
apo  apo': off, i.e. away (from something near), in various senses (of place, time, or relation; literal or figurative)
του definite article - genitive singular masculine
ho  ho: the definite article; the (sometimes to be supplied, at others omitted, in English idiom) -- the, this, that, one, he, she, it, etc.
σταυρου noun - genitive singular masculine
stauros  stow-ros': a stake or post (as set upright), i.e. (specially), a pole or cross; figuratively, exposure to death, i.e. self-denial; by implication, the atonement of Christ -- cross.