German grübeln. Doublet of gräva. grubbla (present grubblar, preterite <span class="searchmatch">grubblade</span>, supine grubblat, imperative grubbla) to ponder to brood, to ruminate...
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Stack trace:
#0 /home/enciclo/public_html/dictious.com/search.php(75): include()
#1 {main}
thrown in /home/enciclo/public_html/dictious.com/inc.main.result.php on line 14