Cover yourself up Definition 1 of 2Pro Tip 1/3Not for Heat Even if it's not cold, you might cover up to avoid sunburn or insects. I covered myself up at the beach to protect against the sun. Pro Tip 2/3Cultural Sensitivity In some cultures, covering up is a sign of modesty, especially for women. Remember to cover yourself up when visiting religious sites. Pro Tip 3/3Casual Phrase The phrase is informal and mostly used among friends or family. Hey, it's chilly in here, cover yourself up.