Definition of "obs"

obs¹

adjective
1. Clipping of observed
noun
uncountable
1. (law enforcement, slang) Police observation.
  Quotations
  But I now knew I was under obs by the Gardai as well as by GMP.
  2017, Jimmy Donnelly, Jimmy The Weed: Inside the Quality Street Gang
  Had you under obs for three weeks.
  2018, Paige Elizabeth Turner, Clock Face of Ills
2. An observation hut.
noun
plural only
1. (medicine) Observation(s) (blood pressure, temperature, etc).