/dredʒ; drɛdʒ/
(also dredger) n machine for scooping or sucking mud, etc from the bottom of a river, canal, etc 挖泥机（从河底挖或吸泥等的机器）.

v
1 [Tn] deepen or clear (a river, etc) with a dredge （用挖泥机）疏浚（河道等）
*They have to dredge the canal so that ships can use it. 他们须疏浚运河河道轮船方可通航.
2 [I, Ipr, Tn, Tn.pr, Tn.p] ~ sth (up) (from sth) bring sth up using a dredge （用挖泥机）挖出或吸出某物
*dredge for oysters 采捞牡蛎
* We're dredging (up) mud (from the river bed). 我们正在（从河床）挖淤泥.
3 (phr v) dredge sth up (usu derog 通常作贬义) mention sth that has been forgotten, esp sth that is unpleasant or embarrassing 重提旧事（尤指不愉快或令人难堪者）
*dredge up details of that episode in Cairo 重提已被遗忘的开罗事件中的许多细节. dredger (also dredge) n boat or machine used for dredging 挖泥船; 挖泥机.

/dredʒ; drɛdʒ/
v [Tn, Tn.pr] ~ A (with B); ~ B over/on A sprinkle (food) with (flour, sugar, etc) （在食物上）撒（面粉、糖等）
*dredge a cake with icing sugar 把糖霜撒在蛋糕上
* dredge icing sugar over a cake 在蛋糕上撒糖霜.

v
[Date: 1500-1600; Origin: Perhaps from Old English dragan 'to pull']
[I and T]
to remove mud or sand from the bottom of a river, harbour etc, or to search for something by doing this
　They were dredging for oysters.
[T + with]
to cover food lightly with flour, sugar etc
dredge up [dredge sth⇔up] phr v
to start talking again about something that happened a long time ago, especially something unpleasant
　Newsweek magazine dredged up some remarks which he made last year.
to manage to remember something, or to feel or express an emotion, with difficulty
　Robertson tried to dredge up an image of her in his mind.
　From somewhere she dredged up a brilliant smile.
to pull something up from the bottom of a river, lake etc