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killer
mastery UK /ˈkɪlə(ɹ)/ US /ˈkɪlɚ/nounadj
card 1 of 10 · idiom completion
High blood pressure is often called a _____ killer because it has no symptoms.
card 1 of 10 · idiom completion
High blood pressure is often called a _____ killer because it has no symptoms.