Call up
Call up verb - Get or try to get into communication (with someone) by telephone.
Signed up
Call up and signed up are semantically related in gather topic. You can use "Call up" instead a verb "Signed up", if it concerns topics such as gather resources, select for military force.
Mutual synonyms
Cite this Source
Signed up and Call up. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/call_up/signed_up
Call up & Signed up. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/call_up/signed_up>.
Signed up or Call up. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/call_up/signed_up.
Google Ngram Viewer shows how "call up" and "signed up" have occurred on timeline