The phrase "specific aim" refers to having a clear and particular goal or objective in mind. It means knowing exactly what you want to achieve and being focused on that one specific outcome. Full definition
It started as part of an ongoing push to reduce greenhouse gas emissions, taking specific aim at transportation, a major contributor of harmful pollutants. (ilsr.org)
It seems to me its very specific aiming directly at these wolves in sheep's clothing. (redeeminggod.com)
After several exchanges, one author joined my thesis committee and I added a new specific aim to my thesis. (sciencemag.org)