bestem means to stem completely; stem all about; hinder. Lexicurio rates it Sui generis — a strength score of 89 out of 100.
Etymology
From be- + stem.
verb
- To stem completely; stem all about; hinder.“Whence she might overglance the boundless boiling of billows, / Then she would rush to bestem the salt-plain's quivering wavelet / And from her ankles bare the dainty garment uplifting, / Spake she these words […]”