[chah-chah] 
noun, plural -chas, verb, -chaed, -cha⋅ing.| 1. | a fast ballroom dance of Latin American origin, similar to the mambo, that follows a rhythmic pattern based upon a quick three-step movement. |
| 2. | to dance the cha-cha. |
| cha-cha (chä'chä) n. A rhythmic ballroom dance that originated in Latin America. intr.v. cha-chaed, cha-cha·ing, cha-chas To perform this dance. [American Spanish chachachá, of imitative origin.] |