opposed to or directed against people who live or arrive in a country of which they are not a legal citizen

His anti-alien tirades did not help to promote his political career.

Anti-alien feelings were mounting. 反外来侨民的情绪越来越高。

opposed to or directed against creatures from other planets

The movie is a tale of an incompetent anti-alien group bent on tracking down and destroying invading aliens. 这部电影讲述了一个无能的反外星组织决心追踪并摧毁入侵的外星人的故事。