seek a knot in a bulrush

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seek a knot in a bulrush

To engage in a futile task; to try to find problems where none exist. A bulrush is a grassy plant that is not prone to knots. You'd have better luck seeking a knot in a bulrush than getting those flowers to grow on such rocky soil. I read the report so many times that the boss will be seeking a knot in a bulrush to try to find errors in it.
See also: knot, seek