What is the meaning of ö-?

Marks a noun as having a second-person possessor.

Marks a postposition as having a second-person object.

Marks a transitive verb as having a second-person patient/object when the agent/subject is of third person with verb forms that take series I markers.

Marks a transitive verb as having a second-person patient/object when the agent/subject is unspecified with verb forms that take series II markers.

Marks an intransitive verb with patient-like argument as having a second-person argument/subject with verb forms that take series I markers and on all intransitive verbs with verb forms that take series II markers.

Marks a verb form derived with n- and -dü or -'jüdü as having a second-person agent/subject.

With following vowel lengthened if in an unreduced open syllable.

allomorph of öt- (detransitivizing prefix).

Source: wiktionary.org