“使闷死”较为常见且自然的英文表达可以是 “smother to death” 。例如:The thick smoke smothered him to death.(浓烟使他闷死了 。)
此外,根据具体语境,“suffocate sb. to death” 也有类似含义,比如:The plastic bag could suffocate the baby to death if left unattended.(如果不注意,塑料袋可能会使婴儿闷死 。)