To frighten
Trouble and to frighten are semantically related. In some cases you can use "Trouble" instead a verb phrase "To frighten".
Trouble
Trouble verb - To experience concern or anxiety.
To frighten and trouble are semantically related. Sometimes you can replace phrase "To frighten" with "Trouble", this terms are similar.
Cite this Source
Trouble and To frighten. (2016). Retrieved 2026, July 31, from https://thesaurus.plus/related/to_frighten/trouble
To frighten & Trouble. N.p., 2016. Web. 31 Jul. 2026. <https://thesaurus.plus/related/to_frighten/trouble>.
Trouble or To frighten. 2016. Accessed July 31, 2026. https://thesaurus.plus/related/to_frighten/trouble.
Google Ngram Viewer shows how "to frighten" and "trouble" have occurred on timeline