de-
pref 前缀 (with vs and related adjs, advs and ns 与动词、 形容词、 副词、 名词结合)
1 opposite or negative of ...的反义或否定
defrost * decentralization.
2 removal of 除掉...: defuse * derailment.
The guests had, of course, realized this from the moment Bessie opened the door for them and, long before the final catastrophe, had had a difficult time trying to conceal their amusement.