writing that is untidy and difficult to read

You might end up with the wrong medication if your pharmacist can’t read your doctor’s chicken scratch. 如果你的药剂师看不懂你医生的潦草字体，你可能会服错药。

Understanding his chicken scratches would've been difficult enough, but his English was really old-fashioned as well. 理解他的狗爬字已经够难的了，还要读他老套至极的英语。

Using the chicken-scratch cursive scrawl of his left hand, he began writing. 他开始用左手潦草地下笔。

a thin straight mark on a surface

I gave my daughter some chalk and she made chicken scratches and sounded out her name. 我给了女儿一些粉笔，她画了几道细线，并一边念自己的名字。

food that chickens enjoy, usually a mixture of seeds, dropped on the ground for them to find in addition to their main food

Given that chicken scratch is a treat, it should not exceed 10% of their daily intake. 刨食鸡饲料是一种奖励性食物，不应该超过每日摄入量的10%。

As its name implies, chicken scratch is something that chickens will scratch around in the dirt to find and eat. 顾名思义，刨食鸡饲料就是让鸡在泥土中抓来抓去寻找和进食的东西。

to write something in an untidy way that is difficult to read

Here are a couple of back-of-the-napkin examples that I chicken scratched over lunch. 这餐巾背后有几个我在午餐时随便写的例子。

He struggled to read her chicken-scratched notes. 他费力地读着她潦草的笔记。

Most men do not decorate their penmanship. They just chicken-scratch. 大多数男人不在意自己的笔迹如何，只是信笔涂鸦。