From Longman Dictionary of Contemporary Englishclose on something/close to somethingclose on something/close to somethingspokenAPPROXIMATELY used to talk about a number, amount etc that is almost exact, but not completely a voyage of close on 2,000 miles → close
Examples from the Corpus
close on something/close to something• Cardinal Agagianian brought the debate to a sudden close on 30 October to forestall further public discussion outside the Council. 