Multiple meanings: throwing motions in baseball, musical tones of specific frequencies, or persuasive presentations to potential clients or investors.
From Middle English picchen, possibly from Old English piccian 'to prick' or 'to pierce'. The various meanings developed from the basic sense of throwing or projecting something forward.
The word 'pitches' beautifully illustrates how English loves multiple meanings - a baseball pitcher 'pitches' the ball at a certain 'pitch' (angle), while entrepreneurs 'pitch' their ideas hoping to hit a home run with investors. All these meanings share the core concept of projecting something toward a target!
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