Catch on
Catch on verb - Understand, usually after some initial difficulty.
Fail
Fail verb - To stop functioning.
Both terms in one sentence
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Earlier, Prince John and his guards fail to see through Robin and Little John's gypsy costumes, though it does make John more perceptive to catch on to Robin the second time around.
Cite this Source
Fail and Catch on. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/catch_on/fail
Catch on & Fail. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/catch_on/fail>.
Fail or Catch on. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/catch_on/fail.
Google Ngram Viewer shows how "catch on" and "fail" have occurred on timeline