From one side to the other of; across.(preposition)
That which is overthwart; an adverse circumstance; opposition.(noun)
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Use "overthwart" in a sentence
"When Sir Gawaine and Ettard awoke of their sleep, and found the naked sword overthwart their throats, then she knew well it was Sir"
"When Sir Gawaine and Ettard awoke of their sleep, and found the naked sword overthwart their throats, then she knew well it was Sir Pelleas 'sword."
"Also in that contree, and in othere also, men fynden longe apples to selle, in hire cesoun: and men clepen hem apples of paradys; and thei ben righte swete and of gode savour. 74 And thoghe zee kutte hem in never so many gobettes or parties, overthwart or end longes, evermore zee schulle fynden in the myddes the figure of the Holy Cros of oure"