belly button
n.
"navel," 1877, colloquial, from belly, n. + button, n.. Also bellybutton, belly-button.
| 词汇 | belly button | 
| 词根词缀 | Online Etymology Dictionary belly button n. "navel," 1877, colloquial, from belly, n. + button, n.. Also bellybutton, belly-button. | 
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