stifle

Origin

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).