Career, acc to Chambers Dict, originally meant 'rush', in the work of Spenser (C16) ~~ & hence developed the meaning of progress thru life or one's chosen occupation; also the verb to rush madly.
Chambers doesn't even [mistakenly in my view as it is widespread & catching on here as Americanisms will - see several previous threads on the topic] include this sense at careen at all, but only the turning over of a boat for purposes of cleaning or repair.

So, sorry over there Bill & Ebbie; but as you continue to call the language you speak 'English', at least have the grace and modesty to accept the judgment of one of the leading English dictionaries.

Now, to return to my question ~~ when did your word replace ours over there? & how & why? Cleaning boats, unlike moving on in a certain direction, has no connection to the rushing about connotation at all that I can see. Don't your dictionaries give that meaning of careen also?: I remember it occurs in Treasure Island, which I believe is a book widely read over there.

~M~