1to rub; to scratch
2to wipe; to polish
3to apply (lipstick, lotion etc)
4to brush (past)
5to shred (a vegetable etc)
Examples
wǒ我xí guàn习惯zài在shuì jiào睡觉qián前bǎ把xié鞋cā擦liàng亮。
我习惯在睡觉前把鞋擦亮。
I make it a point to shine my shoes before I go to bed.
出门前把你的鞋子擦亮。
Shine your shoes before going out.
人们啊，擦亮你的眼睛吧！
Open your eyes, people!