FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

opiso ὀπίσω — op-is'-o — from the same as 3693 with enclitic of direction; to the back, i.e. aback (as adverb or preposition of time or place; or as noun):--after, back(-ward), (+ get) behind, + follow.

see GREEK for 3693