What is the meaning of -ku-?

Forms the present tense in verbs.

Second person singular object concord, you, thee.

negative past tense marker

you, 2st person singular object concord

you, y'all; 2st person plural object concord

there, ku class_(XVII) object concord

Forms the present tense in verbs.

2nd person singular object concord.

Forms the present continuous tense.

2nd person singular object concord.

Source: wiktionary.org