What is the meaning of -tö?

forms the plural of the distant past tense when both the agent and patient (if there is one) of the verb are first- or second-person

forms the plural of performative moods (imperative, prohibitive, jussive, admonitive, and rogative) when both the agent and patient (if there is one) of the verb are first- or second-person

forms a benefactive transitive verb from a noun, with the meaning ‘to bring about X for (someone or something)’, ‘to provide (someone) X’

forms adverbs with an active-participle-like meaning from a handful of transitive verbs

Source: wiktionary.org