Final answer:
The abbreviation hs stands for "at bedtime or hour of sleep". It is commonly used in medical and healthcare settings to indicate the time at which medication should be taken.
Step-by-step explanation:
The abbreviation hs stands for "at bedtime or hour of sleep". It is commonly used in medical and healthcare settings to indicate the time at which medication should be taken. For example, if a doctor prescribes a medication to be taken "hs", it means it should be taken at bedtime or right before going to sleep.