Sunday
/ˈsʌndɪ; `sʌndɪ/ n
(abbr 缩写 Sun)
1 [C, U] the first day of the week (coming before Monday), a day of rest and worship for Christians 星期日; 星期天; （基督教徒的）礼拜日.
2 [C usu pl 通常作复数]
newspaper published on a Sunday 每逢星期日出版的报纸; 星期日刊.
3 (idm 习语) for/in a month of Sundays => month. one's Sunday `best (infml joc 口, 谑) one's best clothes （自己的衣服中）最好的衣服
Go to the party in your Sunday best. 穿上你最好的衣服去参加聚会.