The phrase "drill into" is commonly used to describe the act of imparting knowledge or information to someone through repetitive teaching. However, there are several alternate phrases that can be used to convey the same meaning. For instance, you could say "hammer home" or "pound in" to emphasize the forceful nature of the teaching method. "Drum up" and "cram in" are also viable synonyms that imply a rapid, continuous delivery of knowledge. Other options might include "ingrain," "imbue," or "instill," all of which suggest depth and lasting impact of the information being shared. Ultimately, the synonym chosen will depend on the context, tone, and desired emphasis of the message being conveyed.