What is the meaning of Ko-?

marks an area as the subject of a verb

marks an areal object of a postposition

Second-person singular subject marker for tense modifying adverbs.

alternative form of ka-; used to form causative verbs

to kill, strike down, destroy

chop up

intensifying prefix

co-

co-

co-:

1. together; mutually; jointly

   together; mutually; jointly

   Rōmaji transcription of こ

   co-

   Source: wiktionary.org