If you think aloud, you express your thoughts as they occur to you, rather than thinking first and then speaking. if you read, laugh, say something etc aloud, you read etc so that people can hear you = out loud read/say sth aloud
using the voice; not silently; "please read the passage aloud"; "he laughed out loud
When you say something, read, or laugh aloud, you speak or laugh so that other people can hear you. When we were children, our father read aloud to us `You fool,' he said aloud. silently