实际上是 to gather 的变体。
Together = To-get-her 这个梗小学就被玩坏了呢……
参考：
http://en.wiktionary.org/wiki/together「From Late Middle English together, from earlier togedere, togadere, from Old English tōgædere (“together”), from Proto-Germanic *tō (“to”) + Proto-Germanic *gadar (“together”), from Proto-Indo-European *gʷhedh- (“to keep”), equivalent to to- + gather. Cognate with Scots togiddir, thegither (“together”), Old Frisian togadera (“together”), Middle Dutch tegadere, tegader (“together”), Middle High German gater (“together”). Compare also Old English ætgædere (“together”), Old English ġeador (“together”). More at gather.」