"___ further reflection . . ." (4)
I believe the answer is:
upon
(Other definitions for upon that I've seen before include "Atop" , "Straddling" , "(Placed) on top of" , "Immediately after" , "Supported by (a surface)" .)
I believe the answer is:
upon
(Other definitions for upon that I've seen before include "Atop" , "Straddling" , "(Placed) on top of" , "Immediately after" , "Supported by (a surface)" .)