DSSESa day on which the children at a school have sports competitions 〔小学生参加体育比赛的〕运动(会)日SYN American English field day
Examples from the Corpus
sports day• Except for a sports day once a year, their activities were limited to parading up and down.• But, on prize-giving for sports day, they were always there.• You are pressed to attend a school sports day.