In the Oxford Anthology of English Literature is written thatch-eves not eaves, by the way. Bartleby´s version is the Francis T. Palgrave, ed. (1824–1897). The Golden Treasury. 1875.
The anthology´s version is dated 1819-1820.
cheers
新牛津英语词典
conspire: verb [no object] make secret plans jointly to commit an unlawful or harmful act: they conspired against him [with infinitive] they deny conspiring to defraud the Inland Revenue
[with infinitive] (of events or circumstances] seem to be working together to bring about a particular result, typically to someone's detriment: everything conspires to exacerbate the situation.
ORIGIN late Middle English: from Old French conspire, from Latin conspirare 'agree, plot'. from con - 'together with' + spirare 'breathe'