http://www.thefreedictionary.com/suffocationssuf·fo·cate (sf-kt)
v. suf·fo·cat·ed, suf·fo·cat·ing, suf·fo·cates
v.tr.
1. To kill or destroy by preventing access of air or oxygen.
2. To impair the respiration of; asphyxiate.
3. To cause discomfort to by or as if by cutting off the supply of fresh air.
4. To suppress the development, imagination, or creativity of; stifle: "The rigid formality of the place suffocated her" Thackeray.
v.intr.
1. To die from lack of air or oxygen; be asphyxiated.
2. To feel discomfort from lack of fresh air.
3. To become or feel suppressed; be stifled.