in collar

prep_phrase

in collar

prep_phrase

1

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:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.