Final answer:
The phrasal verb 'call up' can mean to summon for military service or to contact someone by phone, as illustrated by the sentences: 1. The army called up the reservists; 2. I need to call up my contacts.
Step-by-step explanation:
The phrasal verb call up can have a few different meanings depending on the context. It might mean to summon someone for military service, recall from memory, or to contact someone by phone. Here are two example sentences:
- The army called up the reservists during the crisis.
- After the meeting, I need to call up my contacts to discuss the details we agreed on.
In the first sentence, 'call up' is used in the context of summoning someone for military service, and in the second sentence, it is used to mean contacting someone by phone.