Here are some definitions: Barrel of Laughs If someone's a barrel of laughs, they are always joking and you find them funny. Over a Barrel If someone has you over a barrel, they have you in a position where you have no choice but to accept what they want. Since the idiom is said to refer to a person rather than an object or a situation, I would change It was not a barrel of laughs to He was not a barrel of laughs , for example.
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