noun
[ usually sing. ] the moment at which sb doing hard physical activity feels the greatest pain, after which the pain becomes less :
He broke through the pain barrier at 25 kilometres and went on to win his first marathon.
noun
[ usually sing. ] the moment at which sb doing hard physical activity feels the greatest pain, after which the pain becomes less :
He broke through the pain barrier at 25 kilometres and went on to win his first marathon.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005