We found one dictionary that defines the word trenchward:

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1. trenchward: Wiktionary

Definitions from Wiktionary (trenchward) ▸ adverb:  Toward a trench. ▸ Words similar to trenchward ▸ Usage examples for trenchward ▸ Idioms related to trenchward ▸ Wikipedia articles (New!) ▸ Words that often appear near trenchward ▸ Rhymes of trenchward ▸ Invented words related to trenchward