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redound (v.)[redound 词源字典]: late 14c., "to overflow," from Old French redonder "overflow, abound, be in profusion" (12c.), from Latin redundare "to overflow" (see redundant). Meaning "to flow or go back" (to a place or person) is from late 14c.; hence "to rebound" (c. 1500), and "to contribute to" (the credit, honor, etc.), early 15c. Related: Redounded; redounding.[redound etymology, redound origin, 英语词源]
allophone (1): "Any of the various phonetic realizations of a phoneme in a language, which do not contribute to distinctions of meaning. For example, in English an aspirated p (as in pin) and unaspirated p (as in spin) are allophones of p, whereas in ancient Greek the distinction was phonemic", 1930s: from allo- 'other, different' + phoneme.