"mulling" in the verb sense
1. chew over, think over, meditate, ponder, excogitate, contemplate, muse, reflect, mull, mull over, ruminate, speculate
reflect deeply on a subject
"I mulled over the events of the afternoon"
"philosophers have speculated on the question of God for thousands of years"
"The scientist must stop to observe and start to excogitate"
heat with sugar and spices to make a hot drink
Source: WordNet® (An amazing lexical database of English)
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