commander-in-chief
nounUK /kəˈmɑːn.dər.ɪnˈtʃiːf/
US /kəˈmæn.dɚ.ɪnˈtʃiːf/
The top leader who is in charge of all the soldiers in a country.
The president is the commander-in-chief of the armed forces.
OTHER MEANINGS
2. The person who leads a whole group or organization.
She acted as commander-in-chief of the rescue team.
3. A title for the highest-ranking officer in a military branch.
The commander-in-chief reviewed the troops at the parade.
4. The leader with final authority in a time of war.
During the crisis, the king served as commander-in-chief.