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longstop date stresses
busin.	дата выполнения предварительных условий (BRUNDOV); срок выполнения предварительных условий (In a SPA/APA, the date by which the conditions must be satisfied (or waived) for completion to take place, so as to impose ultimate certainty as to completion of the transaction. lexisnexis.co.uk BRUNDOV)
law	предельный срок (возможный вариант перевода термина в SPA = last date by which something must be done: Given that the conditions had not been satisfied by the long stop date, the supply agreement terminated automatically. 'More); срок выполнения отлагательных условий (Kovrigin); контрольная дата (дата выполнения определенных условий сделки) – попался такой вариант, не является предпочтительным) – вношу для коллекции 'More); пресекательный срок (вк)
English thesaurus
longstop date
	⇒ long stop date
law	It is an established practice in M&A transactions that the parties agree on a timeframe in which all the conditions precedent for a transaction need to be fulfilled and the transaction completed. If the transaction remains incomplete at the end of this time, the agreement is either automatically terminated or one of the parties wins the right to withdraw. Such a clause is called a "Longstop Date". (lexology.com LadaP)