growse n.

type of game bird, 1530s, grows (plural, used collectively), of unknown origin, possibly from Latin or Welsh. Originally the moorhen of the British Isles; later the name was extended to similar birds in other places.

1560s, with -some (1) + grue, from Middle English gruen "feel horror, shudder" (c. 1300); not recorded in Old English or Norse, possibly from Middle Dutch gruwen or Middle Low German gruwen "shudder with fear" (compare German grausam "cruel"), or from a Scandinavian source (such as Danish grusom "cruel," grue "to dread," though others hold that these are Low German loan-words). One of the many Scottish words popularized in England by Scott's novels. Related: Gruesomely; gruesomeness.