balker

The English word “balker” has 2 meanings listed here.

noun

Someone or something that balks; a naysayer.
A person who stands on a rock or eminence to observe shoals of herring, etc., and to give notice to the men in boats which way they pass.

From balk + -er.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.