The verb sam√kḷp is fairly rare in our corpus, with only four occurances. In all the cases attested in our sources, it denotes
Saṃ√kḷp derives from the root √kḷp with the addition of the prefix sam. For a discussion of √kḷp see etymology sub voce vikalpa. Suffice it to say that saṃ√kḷp is likely to be linked to √kḷp in the sense of shaping and creating, perhaps, as the Pali dictionary suggests, in the specialised figurative sense of forming in the mind and hence thinking (Pali Dictionary, Chipstead: 1921, s.v. kappeti).