vt.
使烦躁，使苦恼，使焦急，折磨：
Doubts began to fret his mind.
疑惑使他烦躁不安。
You are fretting yourself needlessly.
你在不必要地折磨自己。
侵蚀，腐蚀，使耗损，磨损，擦损，摩擦：
Rust frets metal.
锈腐蚀金属。
Constant use had fretted the sandal strap to the breaking point.
凉鞋由于经常穿，鞋带快磨断了。
磨损成，(经侵蚀而)形成(通道)
使