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The Collaborative International Dictionary
Excur

Excur \Ex*cur"\v. i. [L. excurrere. See Excurrent.] To run out or forth; to extend. [Obs.]
--Harvey.

Wiktionary
excur

vb. 1 (context rare English) To digress. 2 (context rare English) To pass beyond limits; to go to or towards an extreme. 3 (context rare English) To take an excursion.