(simile, colloquial, Britain, derogatory) Very unattractive.

(idiomatic) No harm to one.

(idiomatic) Synonym of get someone's back up: to annoy someone.

(idiomatic) To annoy or anger someone.

(informal, transitive, intransitive) To cease pestering or criticizing someone, i.e. to leave them alone.

(idiomatic) A small and seemingly insignificant addition to a burden that renders it too much to bear; the small thing which causes failure, or causes inability or unwillingness to endure any more of something.

(informal, vulgar) I have a strong need to urinate.

Something potentially harmful or hurtful, such as criticism or insult, that nevertheless has no effect or impact on the target.

To avenge oneself.

Alternative form of rod for one's back