Backbeat

[Little_Girl]

1. A type of music that puts emphasis on beats 2 and 4.
2. A rhythmic quality in music where [a beat] either is slightly late or gives the [illusion] of being slightly late.
3. A personal [trait] of being late.

[Tanya Shivari]

(especially in rock music) an emphasis on one or two of the beats that are not normally emphasized

[Britney]

A strong accent on one of the normally unaccented beats of the bar, used especially in jazz and popular music.