Speaking, promising, or boasting much, but doing little.

(idiomatic) All or nothing. Probably derived from "shoot duck or no dinner".

Things that appear valuable or worthwhile might not actually be so; things that look nice might not be as good as they look.

(idiomatic, sometimes ironic) To finish or complete something; to add a finishing touch. / (idiomatic) To surpass or outdo something.

(idiomatic, US) An expression indicating that the speaker empathizes with members of an identifiable group that was the subject of a disaster, and projects that others empathize as well.

(Britain, idiomatic) Alternative form of all mouth and trousers

(Britain, idiomatic) Superficial, engaging in empty, boastful talk, but not of real substance.

(idiomatic) A thing or person which fails to measure up to its description or advanced promotion.

(idiomatic, vulgar, emphatic) fuck all

(idiomatic, vulgar, emphatic) fuck all