put at ease
see at ease.
Why Was Z Removed From The Alphabet (And Then Put Back)?Z’s history includes a time when it was so infrequently used that it was removed from the alphabet altogether.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.