a speech that US citizens learn, which is a promise to respect the US and be loyal to it. In schools children usually say the Pledge of Allegiance every morning, while looking at the national flag and putting their right hand over their heart: I pledge allegiance to the flag of the United States of America, and to the republic for which it stands, one nation under God, indivisible, with liberty and justice for all.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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