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drill in(to) (someone or something)
1. Literally, to bore into or pierce something. Unfortunately, we need to drill into the ground to try to find the burst pipe.
2. To teach something through repetition. In this usage, a noun or pronoun is used between "drill" and "in." When I was a kid, the times tables were simply drilled into us.
drill something into someone or somethingand drill something in
Fig. to force knowledge into someone or something Learn this stuff! Drill it into your brain. Drill in this information so you know it by heart!
1. To penetrate some surface by boring: The geologist drilled into the Earth's crust.
2. To teach or inculcate something to someone by constant, intense repetition: The teacher drilled the multiplication tables into the bored students. The teacher tried to drill into our heads the capital of every country.