To Evacuate
する verb
If you know that 避難 is "evacuation" then you know that this is the verb form of that: to evacuate.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Will also help to know the reading of the word 避難.
雨が突然降り出したので、先輩と私は桜の木の下で避難しました。
My senior and I found shelter under a cherry blossom tree when the rain started suddenly.