something that helps you relax

It was a relaxer for him, like doodling. 这对他来说是一种放松，就像乱涂乱画一样。

a drug that helps you relax, or that makes part of your body less tense (= tight and stiff)

Temazepam is a drug used as a muscle relaxer or sleeping aid. 替马西泮是一种肌肉松弛药，也可用于助眠。

a special chemical for making curly hair straight or less curly

She packed what she deemed were essentials: cocoa butter, hair relaxer and body spray. 她认为是必需品的东西都带上了：可可脂、头发软化剂和香体喷雾。

Even if you don't want to spend megabucks on relaxers, book a consultation at your salon so you can learn the right way to do it yourself. 即使你不想在头发软化剂上大把花钱，也可以在美发厅约一个咨询服务，这样就可以学会自己做的正确方法。