Knotgrass

Supposed, if taken in an infusion, to stop growth.

“Get you gone, you dwarf;

You minimus, of hindering knotgrass made.”

Shakespeare: Midsummer Night’s Dream, iii. 2.

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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.