the Pledge of Allegiance
noun [ S ] uk/ˌpledʒ əv əˈliː.dʒəns/ us/ˌpledʒ əv əˈliː.dʒəns/
（尤指在美国学校里，孩子们在每天一早要做的活动）宣誓效忠美国
a promise to be loyal to the US that is said especially by American children at school at the start of each day
The teacher asked the children to stand and recite the Pledge of Allegiance. 教师要孩子们站起来并宣誓效忠美国。