洗 + (Modifier) + 澡
洗澡 (xǐzǎo) is a separable verb meaning 'to take a bath' or 'to shower.' Because it is separable, other elements like aspect particles or duration phrases can be inserted between 洗 and 澡. For example, 洗了个澡 means 'took a bath.'
她洗了个热水澡,感觉舒服多了。
Tā xǐle ge rè shuǐ zǎo, gǎnjué shūfu duō le.
She took a hot bath and felt much better.
你先洗个澡再吃饭吧。
Nǐ xiān xǐ ge zǎo zài chīfàn ba.
Take a shower first before eating.
他洗了半天澡还没出来。
Tā xǐle bàntiān zǎo hái méi chūlái.
He's been in the shower forever and still hasn't come out.