Throttle
late Middle English (as a verb): perhaps a frequentative, from throat; the noun (dating from the mid 16th century in sense 2) is perhaps a diminutive of throat, but the history of the word is not clear.
wiktionary
From Middle English*throtel, diminutive of throte(“throat”), equivalent to throat + -le. Compare German Drossel(“throttle”). More at throat.
From Middle English throtlen(“to choke, strangle, suffocate”), from the noun (see above). Compare German erdrosseln(“to strangle, choke, throttle”).
etymonline
throttle (v.)
"strangle to death," c. 1400, probably from Middle English throte "throat" (see throat) + -le, perhaps a frequentative suffix (as in spark/sparkle), or a utensil suffix (as in handle), or simply to distinguish it from throat (v.), which in late 14c. was used to mean "cut the throat of, kill by cutting the throat." Related: Throttled; throttling.
throttle (n.)
1540s, "throat;" it appears to be an independent formation from throat, perhaps a diminutive form, not derived directly from the verb. The mechanical sense is first recorded 1872, short for throttle-valve (1824). Full-throttle (allowing maximum speed) is from 1848 in reference to steam engines.
