sucrer les fraises

Literally, “to sugar the strawberries”, since that action also involves a quivering motion of the hands.^[1]

• IPA^(key): /sy.kʁe le fʁɛz/

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sucrer les fraises

1. (figuratively) to dodder or quiver; to have shaky hands
2. (figuratively, by extension) to be dotty, to go gaga (to become senile)

• “fraise”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.