At __; immediately
I believe the answer is:
once
(Other definitions for once that I've seen before include "Just as a single occurrence" , "'... bitten, twice shy'" , "On one occasion" , "A single time" , "In days past" .)
I believe the answer is:
once
(Other definitions for once that I've seen before include "Just as a single occurrence" , "'... bitten, twice shy'" , "On one occasion" , "A single time" , "In days past" .)