Penetrate/ˈpenətreɪt/ Definition 1 of 5Pro Tip 1/3Physical Entry Used when something physically enters or passes through an object. The nail penetrated the tire. Pro Tip 2/3Not Superficial Suggests more than a surface impact, implying deep insertion. The needle penetrated beyond the first layer of skin. Pro Tip 3/3Potential Resistance Often implies overcoming resistance to enter something. The explorers penetrated the thick jungle.