suffocating

US /ˈsʌf.ə.keɪ.t̬ɪŋ/
UK /ˈsʌf.ə.keɪ.t̬ɪŋ/
1.

verstikkend

Something that is suffocating makes you feel uncomfortably hot or unable to breathe:

:
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I have to open the window - it's suffocating in here!