mind the store
Attend to local or family matters, as in Ask Dad for permission; he's minding the store while Mom's away. This expression transfers looking after an actual business to more general activities. [Colloquial; second half of 1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.