We don't have synonyms for achill yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are chill and schill.
°A sudden penetrating sense of cold, especially one that causes a brief trembling nerve response through the body; the trembling response itself; often associated with illness: fevers and chills, or susceptibility to illness: close the window or you'll catch a chill.
°A sudden penetrating sense of cold, especially one that causes a brief trembling nerve response through the body; the trembling response itself; often associated with illness: fevers and chills, or susceptibility to illness: close the window or you'll catch a chill.