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[ˌəuvə'welmiŋ]

adj. 压倒的,势不可挡的 

拆分: over-在上 + whelm压倒 + -ing形容词词尾

例:
The resolution was approved in the UN Assembly by an overwhelming majority. 这一决议已在联合国大会上以压倒性多数通过。
an overwhelming victory 势如破竹的胜利