[verb] [T] [formal]You hasten something by acting in order to make it happen sooner.I was grateful for his letter which hastened the course of the enquiry.There is little doubt that poor medical treatment hastened her death.(formal) If you hasten to do something, you quickly do it.The president hastened to reassure his people that he was in perfect health.(formal) If you hasten to say/add something, you want to make it clear.It was an unfortunate decision and I hasten to say it had nothing to do with me."I detest everyone in this office - except you, Justin." she hastened to add.
HASTEN
Meaning of HASTEN in English
Cambridge English vocab. Кембриджский английский словарь. 2012