The word 'spiking' originates from the noun 'spike', which traces back to the Old Norse 'spík', meaning a nail or splinter. This Norse term is related to the Latin 'spīca' (ear of grain, head of a plant), both sharing a core concept of a sharp, pointed projection. The addition of the '-ing' suffix, an ancient Germanic participial and nominal suffix, transforms the base noun into a word describing the action or state associated with a spike. Thus, the literal idea of impaling with a sharp point evolved into modern abstract meanings, such as a rapid increase (resembling a sharp line on a graph) or the surreptitious addition of a substance (metaphorically 'piercing' a drink).

Structure: spik (sharp point) + ing (present participle/gerund suffix) 'spik' is a variant of the root 'spike', from Middle English, likely from Old Norse 'spík' (splinter, spike). 'ing' is a suffix from Old English '-ing', '-ung', used to form nouns of action or result, or present participles/adjectives.