step aside/down 退位，下台，（尤指）让位。to leave an important job or position, especially to allow someone else to take your place
 
【例句】
Step aside, please - this lady needs a doctor.
请让一让——这位女士急需看医生。
 
He is unwilling to step aside in favour of a younger person.
他不愿意让位给一个比他年轻的人。