ho (Greek #3588)
the definite article; the (sometimes to be supplied, at others omitted, in English idiom)
KJV usage: the, this, that, one, he, she, it, etc.
Pronounce: ho
Origin: ἡ (hay), and the neuter τό (to) in all their inflections
gregoreuo (Greek #1127)
to keep awake, i.e. watch (literally or figuratively)
KJV usage: be vigilant, wake, (be) watch(-ful).
Pronounce: gray-gor-yoo'-o