Words related to keel
"passage from the mouth of an animal to the stomach," c. 1300 (as a surname), from Old French golet "neck (of a bottle); gutter; bay, creek," diminutive of gole "throat, neck" (Modern French gueule), from Latin gula "throat," also "appetite," which is related to gluttire "to gulp down, devour," glutto "a glutton." De Vaan writes, "We seem to be dealing with an onomatopoeic formation of the form *gul- / *glu-." Compare Old English ceole "throat;" Old Church Slavonic glutu "gullet," Russian glot "draught, gulp;" Old Irish gelim "I devour."
Old English col "not warm" (but usually not as severe as cold), "moderately cold, neither warm nor very cold," also, figuratively, of persons, "unperturbed, undemonstrative, not excited or heated by passions," from Proto-Germanic *koluz (source also of Middle Dutch coel, Dutch koel, Old High German chuoli, German kühl "cool," Old Norse kala "be cold"), from PIE root *gel- "cold; to freeze."
Attested in a figurative sense from early 14c. as "manifesting coldness, apathy, or dislike." Applied since 1728 to large sums of money to give emphasis to amount. Meaning "calmly audacious" is from 1825.
Slang use of cool for "fashionable" is by 1933, originally African-American vernacular; its modern use as a general term of approval is from the late 1940s, probably via bop talk and originally in reference to a style of jazz; the word is said to have been popularized in jazz circles by tenor saxophonist Lester Young (1909-1959). Cool-headed "not easily excited or confused" is from 1742.
1660s (the experience itself is described from 1620s), from Dutch kielhalen, literally "to haul under the keel," an old punishment for certain offenses; from kiel- (see keel (n.)) + halen "to haul, pull" (see haul (v.)). Hence, figuratively, "to reprimand severely." Related: Keelhauled. German kielholen, Danish kjølhale, Swedish kölhala also are from Dutch. Related: Keelhauling.
also kelson, "line of jointed timbers in a ship laid on the middle of the floor-timbers over the keel, binding the floor-timbers to the keel," 1620s, altered (by influence of keel (n.)) from Middle English kelsyng (late 13c.), which probably is of Scandinavian origin (compare Swedish kölsvin, Danish and Norwegian kjølsvin), from a compound of words such as Old Norse kjölr (see keel (n.)) + swin "swine," which was used of timber (see swine), or perhaps the second element is a folk-etymology alteration of another word (such as Norwegian svill "sill"). Or else the whole is from a similarly formed Low German source (kielschwin).