In Charlie's Angels (2019), Sabina & Jane are acting as a lookout for a meeting between Edgar & Elena:

Jane: COS perimeter check.

Sabina: "COS"? I have less than no idea what that means, but you are good up here.

What's the meaning of "COS"?

  • 1
    I'm with Sabrina, have less than no idea what that means
    – Vishwa
    Commented Mar 4, 2020 at 11:20
  • In the military, COS is an abbreviation for Chief of Staff. CoS is an abbreviation for Combat Outpost. Might be the former, as Edgar is a Bosley. Commented Mar 4, 2020 at 14:03
  • In US intelligence circles, COS is Chief of Station—the ranking CIA officer at an embassy or other station.
    – ruffdove
    Commented Oct 14, 2020 at 22:49
  • This is not an answer, but when we were on a Geography field study with an older British dude in India, he would say to do a COS, which to him meant using triangles back in the 1700s to make a map of an area. Sort of like triangulation, I suppose to get an idea where something is. The COS referred to cosine in a sort of geographer's slang. Maybe hollywood spies use COS as slang for the same thing.
    – Mikey
    Commented Nov 10, 2020 at 20:32

1 Answer 1


I've now watched this movie 5 times, and this time it just clicked. Jane was probably using two sentences: "COS" and "Perimeter check?" I'm personally thinking it stands for "Client on Site", so Sabina knew Elena has arrived for the meeting and then asking for a perimeter check.

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