Synonyms of 'second-in-command'
deputyDictionary, assistant, subordinate
The President was replaced by his second-in-command.
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Someone's assistant is a person who helps them in their work.
He had been accompanied to the meeting by an assistant.
Thesaurus for second-in-command from the Collins English Thesaurus
A second-in-command is someone who is next in rank to the leader of a group, and who has authority to give orders when the leader is not there.