Fun fact: frown is in British English the first image and in American English the second one iirc. The origin is French and means something like cloudy

Edit: I got it the wrong way around:

In the UK, a frown is like when you furrow your eyebrows

According to a lingthusiasm podcast discussing Lynne Murphy’s book “The Prodigal Tongue”

Edit 2: it’s less clear cut:

):

Still an improvement