It should be noted that the phrase "fly in the ointment" simply means a drawback. Therefore, it implies a drawback in the friendship between both parties.
You didn't give the complete information. Therefore, an overview of the phrase will be given. The phrase implies a drawback or a detrimental factor.
The phrase "fly in the ointment" simply means a drawback. The term was gotten from a biblical proverb. Dead flies caused the ointment of the apothecary to bring a stinking favor.
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