The term 'Bossa Nova Kin' refers to a style of music that originated in Brazil in the 1950s. It is a fusion of SAMBA and jazz, and is characterized by its syncopated rhythms and melodic improvisation. The crossword solution for this term is 'SAMBA, ' which is a Brazilian dance and musical genre that is closely related to Bossa Nova. SAMBA is known for its lively, upbeat rhythms and is often accompanied by singing and clapping.