The Collaborative International Dictionary
Scythe \Scythe\ (s[imac]th), n. [OE. sithe, AS. s[=i][eth]e, sig[eth]e; akin to Icel. sig[eth]r a sickle, LG. segd, seged, seed, seid, OHG. segansa sickle, scythe, G. sense scythe, and to E. saw a cutting instrument. See Saw.] [Written also sithe and sythe.]
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An instrument for mowing grass, grain, or the like, by hand, composed of a long, curving blade, with a sharp edge, made fast to a long handle, called a snath, which is bent into a form convenient for use.
The sharp-edged scythe shears up the spiring grass.
--Drayton.Whatever thing The scythe of Time mows down.
--Milton. (Antiq.) A scythe-shaped blade attached to ancient war chariots.
Wiktionary
Etymology 1 n. (obsolete form of scythe English). The spelling with /sc-/ was influenced by unrelated Latin word (term scissor cutter Latin), and (term scindere to split Latin). vb. (obsolete form of scythe English) Etymology 2
vb. (context dialect dated English) To sigh.
Usage examples of "sithe".
I said nothin' at them fearful words, only my groans and sithes became deeper and more voyalent.
All the sound reasons weighed as nothin' with him, but 2 or 3 groans, and a few sithes settled the matter.
For sikerly whan I was bore, anon Deeth drough the tappe of lyf, and leet it gon, And ever sithe hath so the tappe yronne, Til that almoost al empty is the tonne.