under someone's wing
Guided or protected by someone, as in The department head asked Bill to take Joe under his wing during his first few weeks with the firm. This metaphoric term alludes to the mother hen sheltering her chicks. [1200s]
What Does Calling Someone “Mom” On The Internet Mean?While Kim Kardashian was busy “breaking the Internet” with her controversial photoshoot for Paper in November of 2014, New Zealand singer/songwriter Lorde was teaching the world—or at least her Twitter and Tumblr followers—about a new slang use of the word mom.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.