One of the mysteries of the English language finally explained.
1Medicine. A beat of the heart or of the pulse following a main or normal beat; (in later use) specifically an extrasystole. Now rare.
2An ending to a trill comprising two notes, the first being one step lower than the main note, the second being the main note itself.
3An offbeat; an accentuated backbeat.
Mid 19th century. From after- + beat. In sense 1 after German Nachschlag.
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