71 entries under strengthen topic. ×
| establish | |
| firm up(expression, severe, exercise, fortify) | |
| fix | |
| fortify | |
| heap on(verb, expression, increase, severe) | |
| hike up(verb, expression, increase, improve, expand) | |
| invigorate | |
| jack up(verb, expression, increase, improve, expand) | |
| make firm(expression, fortify) | |
| pile on(verb, expression, increase, severe) | |
| settle |
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| APA | Smart Define. (2015). deepen thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/deepen/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "deepen thesaurus" https://smartdefine.org/deepen/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, deepen thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/deepen/thesaurus/synonyms>. |
| MLA | Smart Define. "deepen thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/deepen/thesaurus/synonyms> |