{adv.} As expected. * /Charles was afraid he had done badly on the test, and sure enough, his grade was failing./ * /The children saw a familiar shape coming up the street and hoped it was their lost dog. When it came near, sure enough, it was Spot./ Compare: SURE THING(2).
SURE ENOUGH
Meaning of SURE ENOUGH in English
Slang English vocab. Английский сленговый словарь. 2012