[hak-ee] 
Trademark.| 1. | a brand of footbag. |
| 2. | a game in which a footbag is juggled with the feet. |
| Hack·y Sack (hāk'ē sāk') A trademark used for a footbag. This trademark often occurs in print hyphenated or in uppercase or lowercase as a name for the game of footbag. |
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