Open up and Retard

Opposite meaning terms

Open up verb - Cause to open or to become open.

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Retard is an antonym for open up in timing topic.

Retard verb - To cause to move or proceed at a less rapid pace.

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Open up is an antonym for retard.

Cite this Source

Retard and Open up. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/open_up/retard

Open up & Retard. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/open_up/retard>.

Retard or Open up. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/open_up/retard.

Google Ngram Viewer shows how "open up" and "retard" have occurred on timeline