Common Meanings
1
chá碴
A cause for dispute or disagreement; a fault or a flaw that one deliberately seeks out to provoke an argument. Often used with '找' (to find).
他总是喜欢找别人的碴儿，真是让人不高兴。
He always likes to find fault with others; it's really annoying.
a splinter or fragment that can pierce the skin
小心别让木头碴扎到手。
Be careful not to get a wood splinter in your hand.
2
chā碴
Used in the idiom 'hú zi lā chā' (胡子拉碴) to describe a face with a full, unkempt, and unshaven beard.
他熬夜加班后，第二天早上胡子拉碴的，看起来很疲惫。
After working overtime all night, he looked very tired the next morning with an unkempt beard.