crystal clear, be

1. Also, be clear as crystal. Be easy to understand, have a very obvious meaning. For example, The directions for installing the door are crystal clear, or Her intentions are clear as crystal. Allusions to crystal's very high degree of transparency have been made since the 15th century.

Example Sentences

My master, boy, has made it crystal clear: Be but a Mars, and you shall have your Venus.

Read more on Project Gutenberg