We found one dictionary that defines the word trenchwise:

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1. trenchwise: Wiktionary

Definitions from Wiktionary (trenchwise) ▸ adverb:  In the manner of a trench or ditch. ▸ Words similar to trenchwise ▸ Usage examples for trenchwise ▸ Idioms related to trenchwise ▸ Wikipedia articles (New!) ▸ Words that often appear near trenchwise ▸ Rhymes of trenchwise ▸ Invented words related to trenchwise