Where does “lose one's cool” come from?

lose one's cool (English) comes from English one's, from English one, from Middle English one, from Middle English onen, from Middle English -en, from Old English -en, from Old Norse -inn, from Proto-Norse -īna- — adjectival suffix.

lose one's cool (English): To become upset or disconcerted; to lose one's...

Definitions

  1. To become upset or disconcerted; to lose one's...

Ancestry of “lose one's cool”, step by step

lose one's cool traces back through 3 separate lines of ancestry.

via English one's

StepLanguageWordMeaning
1Englishone'sBelonging to one
2EnglishoneThe number represented by the Arabic numeral 1;...
3Middle EnglishoneAlternative form of on; Alternative form of hone;...
4Middle Englishonento unify; to join together; to gather together;...
5Middle English-enDenotes the past participle form when attached to...
6Old English-enmæġþ + API → mæġden; cocc + API → cycen, cicen;...
7Old Norse-innUsed to create adjectives from nouns, meaning...
8Proto-Norse-īna-
9Proto-Germanic-īnaz-en
10Proto-Indo-European-iHnosCreates adjectives of materials
11Proto-Indo-European-no-adjectival suffix

via English cool

StepLanguageWordMeaning
1EnglishcoolHaving a slightly low temperature; mildly or...
2Middle Englishcool
3Middle Englishpekpeak
4Middle EnglishpikeAlternative form of pyke; pike; sharp point, iron...
5Old Englishpīcpointed object, pick axe
6Proto-Germanic*pīk
7Latinpixpitch, tar
8Proto-Indo-Europeanpik-to be angry; pitch; resin
9Proto-Indo-Europeanpi-sap, juice

via English lose

StepLanguageWordMeaning
1EnglishloseTo cause to cease to be in one's possession or...
2GermanNikolausa representation of St. Nicholas; the day of 6th...
3LatinNīcolāus
4Ancient GreekΝικόλαοςNicolas
5Ancient Greekλᾱόςpeople; men; the people
6Proto-Helleniclāwóspeople, crowd
7Proto-Indo-Europeanleh₂wospeople
8Proto-Indo-Europeanleh₂-to bark, howl; to be concealed
Every word from Proto-Indo-European -no-Every word from Middle English -enEvery word from Proto-Germanic -īnaz