“Keep one's cool”in other languages

Same idea, different pictures

All three cool something down. English keeps its cool, and Danish pours cold water into the blood, slå koldt vand i blodet.

Egyptian Arabic puts a summer watermelon in your belly, حط في بطنك بطيخة صيفي: nothing calms you like cold watermelon on a hot day. It's said to reassure someone.