as if; as though; just like
まるで expresses that something is just like or as if something else, often used with similes.
まるで is an adverb that strengthens a comparison, meaning 'just like' or 'as if'. It is commonly used in similes, and the comparison is often made explicit with よう, みたい, そう, or らしい. For example, まるで夢のようだ means 'It's just like a dream.' Without these helping words, まるで can be used directly before a noun, as in まるで子供, but that is less common and may sound a bit literary. In everyday speech, you'll almost always hear it with みたい or よう.