stumble (redirected from stumble on)

a stumbling block

a problem which prevents someone from achieving something. Lack of willingness to compromise is the main stumbling block to reaching a settlement. (often + to) Money, obviously, is a major stumbling block in any project of this size.

See also: block

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stumble across someone/something

to meet someone or find something unexpectedly. Lee has stumbled across a plot to sell high-tech US weapons to international terrorists. Border Patrol agents stumbled on the drugs when they were on a routine patrol.

See also: across