| dig down(verb, expression, turn, produce, clean) | |
| disable(hurt, challenge, weaken, frustrate, blunt) | |
| discover(verb, turn, produce, clean, find) | |
| dive | |
| double sap | |
| drain | |
| drawbridge | |
| dugout | |
| eat away(expression, hurt, ruin, challenge, weaken) | |
| egress | |
| enfeeble(hurt, ruin, challenge, weaken, frustrate) | |
| enfilade | |
| enter(verb, turn, produce, clean, discover) | |
| entrance | |
| entrenchment | |
| erode(hurt, ruin, challenge, weaken, frustrate) | |
| exhume(verb, turn, produce, clean, discover) | |
| exit | |
| fire trench | |
| fistula |
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| APA | Smart Define. (2015). tunnel thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/tunnel/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "tunnel thesaurus" https://smartdefine.org/tunnel/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, tunnel thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/tunnel/thesaurus/synonyms>. |
| MLA | Smart Define. "tunnel thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/tunnel/thesaurus/synonyms> |