- single-room occupancy.
- standing room only.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for sro
It was SRO in the meeting room, packed to the gills with the entire ad-hoc, except for my new recruits.Down and Out in the Magic Kingdom
- standing room only
- British Statutory Rules and Orders
- self-regulatory organization
Word Origin and History for sro
1941, initialism for standing room only.
Online Etymology Dictionary, © 2010 Douglas Harper