Follow doctor's orders.
Meaning: This means to adhere to or comply with the instructions or commands given by a medical professional who is trained to treat illnesses or injuries. It's like saying, He needs to do as the doctor says.
Choice of Words: Follow is a verb that means to adhere to or comply with something. Doctor's is a possessive noun that refers to a medical professional who is trained to treat illnesses or injuries. Orders is a plural noun that refers to instructions or commands given by a person in authority.
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