歌う (うたう) means 'to sing.' This verb is used when performing a song with your voice. You typically use the particle 'を' to indicate the song being sung. For example, '歌を歌います' (Uta o utaimasu) means 'I sing a song.'

歌う (うたう) は「歌う」という意味です。歌を声に出して歌うときに使います。「歌を歌います」