The phrase "hammer home" means to emphasize or reinforce a point or idea strongly, sometimes using repetitive or forceful language, in order to make sure it is understood or remembered. Full definition
If you're applying for a similar job, hammer home what you're doing now to present yourself as an easy fit. (blog.gojobhero.com)
Nothing we all didn't already know, but seeing that 47 minute number really hammered home just how taxing the first three games have been on both teams in that series (not to mention their fans). (sbnation.com)
Reality is often better than fiction in March Madness, a fact hammered home in the first two rounds of this tournament. (sbnation.com)