to open one's mouth to be surprised 2 realizations
ACCEPTED Realization 1
Type Polysemy
Language Meadow Mari
Lexeme умшам караш
Meaning 1 to open one's mouth
Direction
Meaning 2 to be surprised

Теве эрла Макар умшажым кара


Indeed Makhar will open his mouth wide tomorrow

Reference Marij jylme muter
Comment

The direction of the shift is evident from the non-compositionality of the second menaing

ACCEPTED Realization 2
Type Derivation
Language Old French
Lexeme 1 baer
Lexeme 2 ébahir
Meaning 1 to open one's mouth

bayer aux corneilles (expression)


to stand gaping

Direction
Meaning 2 to surprise

s’ébahir d’une nouvelle


be astonished at a piece of news

Reference DAF
Comment

The word "baer" is a variant of "bayer" from old texts