Stalking
来自Big Physics
late Old English -stealcian (in bistealcian ‘walk cautiously or stealthily’), of Germanic origin; related to steal.
wiktionary
stalking
From Middle English stalkynge, stalkyng, from Old English stealcung, from Proto-West Germanic *stalkungu, equivalent to stalk + -ing.
From stalk(“the stem of a plant”) + -ing.