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auxiliary
mastery UK /ɔːɡˈzɪl.(j)ə.ɹi/ US /ɔɡˈzɪl.(jə).ɹi/adjnoun
card 1 of 10 · fill in the blank
The main generator failed, so we switched to the _____ power supply.
card 1 of 10 · fill in the blank
The main generator failed, so we switched to the _____ power supply.