Definition (noun) (heraldry) in medieval times, an emblem used to decorate a helmet
Definition (noun) a showy growth of e.g. feathers or skin on the head of a bird or other animal
Definition (verb) lie at the top of
In EM waves the shape is continuous consisting of crusts & troughs..so crest is like Crust i.e upper part/highest point of that wave.
crestfallen means sad, depressed, if we remember the mnemonic we used for crestfallen was falling from height, so sad or depressed, so CREST means HIGHEST/TOPMOST POINT
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