Plural of anacrusis; the unstressed syllables or notes that occur at the beginning of a musical or poetic line, before the main metrical pattern starts.
From anacrusis, via Greek ana- (back) + krousis (striking, from krouein, to strike). The term originally referred to an upbeat in music that 'strikes back' before the formal beat begins.
If you hum 'ta-DUM ta-DUM,' that first quiet 'ta' is the anacrusis—it's the musical pickup note that gets you ready for the main beat, and it's why some poems and songs feel 'bouncy' or ready to go!
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