(UK, idiomatic) Used as a softening preface to a statement that might be taken as offensive or malicious.

(dated, informal, US) I am your partner; I will join you; I will work with you; I will fight you; I will dance with you.

Alternative form of I tell a lie

(colloquial) Synonym of I can tell you

(colloquial) to be honest, to tell the truth

(slang) Said as a response to laughing at or when making an offensive joke

The expected, polite response to how are you?

(Britain) Indicates a selfish attitude, not worried about any problems one's friends and neighbours might have. Often associated with strikes and other trade union industrial actions.

Used to express enthusiastic support for the referent of that.

(childish) Countering an attack on one's character.