in collar en · ADP
Meanings
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(idiomatic, slang) Synonym of in harness (“employed; at work”).
[…] so the moment the site Foreman at Wheatfield Way gave Frank the nod we were back in collar, it had been well over four months, couldn't wait to get back to earn some money.
2010, Patrick Shortle, Full Circle: An Autobiography, page 109: