add up
— phrasal verb with add us/æd/verb [ I/T ]
(INCREASE)
to increase gradually until there is a large amount:
The changes in air quality are small, but after a while they do add up and affect people's health.
英语词典包含110679条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。