Definition of Uncle Sam in English:

Uncle Sam

Line breaks: Uncle Sam
A personification of the federal government or citizens of the US.

Origin

early 19th century: said (from the time of the first recorded instances) to have arisen as an expansion of the letters US.

Definition of Uncle Sam in:

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope