1. to refuse; to reject; to turn down; to dismiss
だがあっさりと案は退けられる。But the proposal is flatly rejected.
2. to repel; to repulse; to drive away; to beat off; to defeat
いかなる脅威も退けてみせる。I will repel any threat.
3. to make (someone) leave; to send away; to turn away
彼は人を退けて、一人で考え込んだ。He sent everyone away and sat alone, lost in thought.
4. to force (someone) to leave their post; to oust; to remove; to expel