creep up
1.（数量、价格、水面等）逐渐增长
to gradually increase in amount, price, etc.
House prices are creeping up again.
住房价格又在渐渐上涨。
The inflation rate has been creeping up to 9.5 per cent...
通货膨胀率已攀升至9.5%。
The temperature crept up to just above 40 degrees
温度攀升至40度出头。
The average number of students in each class is creeping up from three to four.
每个班的平均学生人数已经从3人增长到了4人。
The downward trend went into reverse and the scores started to creep up again.
比分下降的趋势发生逆转，分数又开始逐渐上升了。
One bad winter we watched the river creep up the lower meadows.
一个气候坏的冬季，我们眼看着河水漫到较低的草地上。
2.creep up on sb有两个意思：
1）.
（通常从后面）缓慢地悄悄靠近
to move slowly nearer to sb, usually from behind, without being seen or heard
Don't creep up on me like that!
别那样蹑手蹑脚地靠近我！
He had crept up on his unsuspecting victim from behind.
他从背后悄悄逼近了那毫无戒备的受害者。
2）.
（尤指不知不觉地）开始影响（某人）
to begin to affect sb, especially before they realize it
Tiredness can easily creep up on you while you're driving.
开车时会很容易不知不觉地就累了。
3. creep up （to）SP. 人或动物悄悄地缓慢行进；蹑手蹑脚地移动，蹑手蹑脚地去某地
Back I go to the hotel and creep up to my room
我回到旅馆，蹑手蹑脚地上楼回到房间。
I crept up the stairs, trying not to wake my parents.
为了尽量不吵醒父母，我蹑手蹑脚地上了楼。