I had a very good Welsh friend when our children were young, before she moved away, who spent her early years in Wales, then her family moved to Spain, tri lingual as a result, but English was on the back burner when she was growing up and she told me she only started speaking it fluently when she was about 12 or so. My friend was an archetypal blonde and some people mistook her for an airhead which she wasn't. There was a girl in our circle who wasn't very nice and called her a "bimbo". She'd never heard the word in the context it was meant, when she was living in Spain "Bimbo" was a make of bread and she said she couldn't understand why so and so was calling her "bread". We just collapsed when I told her what it meant it was always on ongoing joke between us.
Sorry digressed from the actual thread.