http://dictionary.oed.com/cgi/entry/50019600?...begone
[Really two words be gone (cf. be off),
long used without analysis in the imperative as expressing a single notion, and so written as one word; recent writers have extended this, without any good reason, to the infinitive. But cf. the similar beware.]
a. c1370 Robt. Cicyle 52 He stode, And callyd the portar, ‘Gad'lyng, begone!’ 1610 Histrio-m. III. 99 Begone yee greedy beefe-eaters. a1719 ADDISON (J.) Begone! the goddess cries with stern disdain. 1853 Arab. Nts. (Rtldg.) 89 Begone, and remember I am impatient for your return.
b. [1660 JER. TAYLOR Worthy Commun. i. 61 He bad him be gon and fly from his Fathers wrath.] 1816 J. WILSON City of Plague I. i. 265 Let us begone, the day is wearing fast. 1865 CARLYLE Fredk. Gt. (1873) II. 135 Kaiser's Ambassador..is angrily ordered to begone.
Used for the word or command ‘Begone!’1820 SCOTT Abbot xi, My Lady made me brook the ‘Begone.’
Formerly sometimes for be (= been) gone.
1440 J. SHIRLEY Dethe K. James (1818) 17 The Kyng..denyd that they had all begone [been gone].
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http://www.dwds.de/?kompakt=1&sh=1&qu=fortmachenfortmachen, machte fort, hat/ist fortgemacht
1. von einem Ort weggehen (hat/ist)
a) umg. sich f. sich eilig wegbegeben (hat): sich heimlich, schnell f.; Nun mach ich mich beizeiten fort (aus dem Staube)! Goethe Faust I 3004; mach dich bloß fort!; verhüll. sterben: Da hat er sich aber schnell fortgemacht Kluge Kortüm 677