What is the origin of 'sleep tight'?

Read moreOne of the mysteries of the English language finally explained.

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Prove that (something) is false.

*‘he has given the Department of Transport two months to disprove the allegation’*-
*‘Any data from these configurations would be useful in proving or disproving statement two above.’* -
*‘This isn't such a big problem for science or engineering types, as of course there are real-world criteria for proving or disproving a theory or criticising a methodology.’* -
*‘In that case, such a hypothesis would then have to withstand the rigors of both scientific method (empirically testing and proving or disproving the hypothesis) and peer review.’* -
*‘But if you say you're measuring something that's proving or disproving Einstein's theory, then all sorts of doors open.’* -
*‘I'll dip into the records at the state library to prove or disprove this claim later.’* -
*‘It is understood that DNA and other tests carried out in the immediate aftermath of the killing are central to proving or disproving the main line of the inquiry being pursued by the 40-strong team.’* -
*‘Times articles have, on numerous occasions, reported allegations against public figures, organizations or governments without independently proving or disproving them.’* -
*‘To date there is no hard evidence to prove or disprove this myth.’* -
*‘And if so, has your colleague proved or disproved his conjecture?’* -
*‘Men have expended their time and energy searching, proving and disproving the creator.’* -
*‘I was never able to prove or disprove that translation, so I'll just go on believing it.’* -
*‘There have been no archaeological excavations to prove or disprove this theory.’* -
*‘There is little evidence to prove or disprove this theory, since little is known about the Illyrian language.’* -
*‘New business units were started to prove or disprove product and service ideas.’* -
*‘I can't tell if this proves or disproves my point.’* -
*‘It seems as if the main aim of the analyses offered in this collection is not to prove or disprove a given model.’* -
*‘This hypothesis is then subject to further investigation to prove or disprove the theory.’* -
*‘That value is equivalent to the weight of a given piece of evidence in proving or disproving a fact at issue.’* -
*‘Hopefully the second wireless should turn up next week so we can either prove or disprove our theory and get things sorted once and for all.’* -
*‘Testing again in a few years would give us better data that might prove or disprove that hypothesis.’*

View synonyms**refute**, prove false, show to be false, give the lie to, rebut, deny, falsify, debunk, negate, invalidate, contradict, confound, be at odds with, demolish, discredit-

Late Middle English: from Old French desprover.