back and forth
 來來往往地,來回,反復


 Back, adv.
 1. In, to, or toward, the rear; as, to stand back; to step back.
 2. To the place from which one came; to the place or person from which something is taken or derived; as, to go back for something left behind; to go back to one's native place; to put a book back after reading it.
 3. To a former state, condition, or station; as, to go back to private life; to go back to barbarism.
 4. (Of time) In times past; ago. “Sixty or seventy years back.”
 5. Away from contact; by reverse movement.
    The angel of the Lord . . . came, and rolled back the stone from the door.   --Matt. xxviii. 2.
 6. In concealment or reserve; in one's own possession; as, to keep back the truth; to keep back part of the money due to another.
 7. In a state of restraint or hindrance.
    The Lord hath kept thee back from honor.   --Numb. xxiv. 11.
 8. In return, repayment, or requital.
    What have I to give you back?   --Shak.
 9. In withdrawal from a statement, promise, or undertaking; as, he took back the offensive words.
 10. In arrear; as, to be back in one's rent. [Colloq.]
 Back and forth, backwards and forwards; to and fro.
 To go back on, to turn back from; to abandon; to betray; as, to go back on a friend; to go back on one's professions. [Colloq.]

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 Forth v.
 1. Forward; onward in time, place, or order; in advance from a given point; on to end; as, from that day forth; one, two, three, and so forth.
    Lucas was Paul's companion, at the leastway from the sixteenth of the Acts forth.   --Tyndale.
    From this time forth, I never will speak word.   --Shak.
    I repeated the Ave Maria; the inquisitor bad me say forth; I said I was taught no more.   --Strype.
 2. Out, as from a state of concealment, retirement, confinement, nondevelopment, or the like; out into notice or view; as, the plants in spring put forth leaves.
 When winter past, and summer scarce begun,
 Invites them forth to labor in the sun.   --Dryden.
 3. Beyond a (certain) boundary; away; abroad; out.
    I have no mind of feasting forth to-night.   --Shak.
 4. Throughly; from beginning to end. [Obs.]
 And so forth, Back and forth, From forth. See under And, Back, and From.
 Forth of, Forth from, out of. [Obs.] --Shak.
 To bring forth. See under Bring.


 back and forth
      adv : moving from one place to another and back again; "he
            traveled back and forth between Los Angeles and New
            York" [syn: backward and forward, to and fro]