名詞 drop-out:

1. someone who quits school before graduation
   同義詞：dropout
2. someone who withdraws from a social group or environment
   同義詞：dropout

動詞 drop-out:

1. give up in the face of defeat of lacking hope; admit defeat
   同義詞：drop out, give up, fall by the wayside, drop by the wayside, throw in, throw in the towel, quit, chuck up the sponge
2. leave school or an educational program prematurely
   同義詞：drop out