hark comes from Middle English herken, harken, from Old English heorcnian ('to listen'), related to hieran ('to hear'), from Proto-Germanic *hauzijaną. The history explains the modern form through the named earlier word or formation, without requiring a separate speculative ancestry. In present English, the verb sense is "to listen attentively; used to call attention to a sound", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as hearken and hear. Its semantic neighborhood includes listen, hearken, attend, and heed, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Old English heorcnian and Proto-Germanic *hauzijaną.