"treks" in the noun sense
a journey by ox wagon (especially an organized migration by a group of settlers)
any long and difficult trip
"treks" in the verb sense
journey on foot, especially in the mountains
"We spent the summer trekking in the foothills of the Himalayas"
make a long and difficult journey
"They trekked towards the North Pole with sleds and skis"
Source: WordNet® (An amazing lexical database of English)
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