away
adv.
late Old English aweg, earlier on weg "on from this (that) place;" see a-(1) + way, n.. Colloquial use for "without delay" (fire away, also right away) is from earlier sense of "onward in time" (16c.). Intensive use (as in away back) is American English, first attested 1818.
〔李〕[a-=on 在…上；way n.路⇒“on one's way，hence，from a place 在路上，即不在某地”→] I ad. from a place 离…