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Idioms and Phrases with crystal clear, be

crystal clear, be

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.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.