Meaning of “suffocate” - Learner’s Dictionary

suffocate

verb [ I, T ] uk us /ˈsʌfəkeɪt/

to die because you cannot breathe or to kill someone by stopping them from breathing:

He suffocated her with a pillow.
suffocation uk us /ˌsʌfəˈkeɪʃən/ noun [ U ]

(Definition of “suffocate” from the Cambridge Learner’s Dictionary © Cambridge University Press)