sure as shooting

adjectives

absolutely certain

"it is sure as shooting that they will come"

is similar to

established beyond doubt or question; definitely known

"what is certain is that every effect must have a cause"; "it is certain that they were on the bus"; "his fate is certain"; "the date for the invasion is certain"

certain

adverbs

definitely or positively (`sure' is sometimes used informally for `surely')

"the results are surely encouraging"; "she certainly is a hard worker"; "it's going to be a good day for sure"; "they are coming, for certain"; "they thought he had been killed sure enough"; "he'll win sure as shooting"; "they sure smell good"; "sure he'll come"

certainly, for certain, for sure, sure, sure as shooting, sure enough, surely