crow's nest

/K R OW1 Z N EH1 S T/
noun
  1. 1

    A small open-top shelter, originally a cask, on the top of the foremast, large enough to accommodate a lookout. It was used by whalers to watch for a blow (spout), or in icebound waters to seek a channel.

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Source: https://en.wiktionary.org/wiki/crow's%20nest