What's "nasal douche?"
Native speaker’s answer
Rebecca
To "douche" something means to clean out a body cavity. It's often used in relation to one's genitals or private parts but can be used for other bodily cavities too, like a nose. So it could be regarded as inappropriate to mention in some cases! Ex: They say you shouldn't douche if you're pregnant. Ex: Sometimes, a nasal douche can help with a cold or flu.