The term "cave into" represents an action of giving up or surrendering to pressure or influence. The antonyms for this phrase could be resist, stand firm, persevere, withstand, or hold one's ground. When we resist, we refuse to give in to pressure or temptation, and we stand firm on our beliefs and principles. When we persevere, we persist in our efforts despite challenges, setbacks, or opposition. When we withstand, we endure or bear up under pressure or attack and do not yield. Finally, when we hold one's ground, we maintain our position and do not retreat or surrender. These antonyms demonstrate strength, determination, and the ability to overcome adversity.