stifle

The verb is derived from Late Middle English stuflen (“to have difficulty breathing due to heat, stifle; to suffocate by drowning, drown”) [and other forms]; further etymology uncertain. Also found in Middle English forstyflyd (“stifled, choked”, past participle).

Perhaps derived from Middle English stuffen (“to kill by suffocation; to stifle from heat; to extinguish, suppress (body heat, breath, humour, etc.); to deprive a plant of the conditions necessary for growth, choke”) + -len (frequentative suffix). Stuffen is derived from Old French estofer, estouffer (“to choke, strangle, suffocate; (figuratively) to inhibit, prevent”) [and other forms] (modern French étouffer), a variant of estoper, estuper (“to block, plug, stop up; to stiffen, thicken”) (modern French étouper (“to caulk”)), influenced by estofer (“to pad, stuff; to upholster”) (modern French étoffer). Estoper is derived from Vulgar Latin *stuppāre, from Latin stuppa (“coarse flax, tow”) (as a stuffing material; from Ancient Greek στύπη (stúpē), στύππη (stúppē) (compare στυππεῖον (stuppeîon)); probably from Pre-Greek) + -āre. According to the Oxford English Dictionary a derivation from Old Norse stífla (“to dam; to choke, stop up”) “appears untenable on the ground both of form and sense”.

The noun is derived from the verb.