slip out

slip out idiom
  1. See let slip out.
  2. Also, slip away or off. Leave quietly and unobtrusively, as in She slipped out without telling a soul, or Let's slip away before the sermon, or Jason and Sheila slipped off to Bermuda. The use of slip with away dates from about 1450; out from the first half of the 1500s; off from the mid-1800s.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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