Call up and Make ready

Call up verb - Get or try to get into communication (with someone) by telephone.

Make ready and call up are semantically related in movement topic. In some cases you can use "Make ready" instead a verb "Call up", when it comes to topics like convert for military use.

Call up and make ready are semantically related in movement topic. Sometimes you can use "Call up" instead a verb phrase "Make ready", if it concerns topics such as convert for military use.