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checker
mastery UK /ˈtʃɛkə/ US /ˈt͡ʃɛkɚ/nounverb
card 1 of 10 · fill in the blank
He is an _____ checker, constantly verifying that all doors are locked.
card 1 of 10 · fill in the blank
He is an _____ checker, constantly verifying that all doors are locked.