creep up
phrasal verb with creep verb [ I usually + adv/prep ] uk/kriːp/ us/kriːp/ crept | crept
（价值或数量）慢慢增加，逐渐上升
If the value or amount of something creeps up, it slowly increases.
Over the last year, the rate of inflation has crept up to almost seven percent. 过去一年里，通货膨胀率逐渐上升，几乎达到了7%。