What is the meaning of Och?

general interjection of confirmation, affirmation, and often disapproval.

an expression of anger, frustration, surprise

alas

to enter

opossum

expressing endearment, pity, consideration, etc.

also

even

oh! (expresses surprise or realization)

alas

and; used to connect two homogeneous (similar) words or phrases

and; used to denote the last item of a list

and, plus

used to connect two finite verbs to denote that the two actions are performed at the same time, often used similarly to the gerund in other languages

to; in order to; used to connect two finite verbs to denote that the first is done in order to be able to do the second

introduces a main clause which somehow is bound to a previous clause

and, so, so what

Source: wiktionary.org