peeping Tom	a person who obtains sexual gratification by observing others surreptitiously
doubting Thomas	a person who insists on proof before he will believe anything; sceptic
smart Alec	mądrala
bobby	A police officer.
Jack of all trades	a person who undertakes many different kinds of work
Tom, Dick or Harry	anyone, especially people that you do not know or do not think are important
keeping up with the Joneses	dorównywać innym
robbing Peter to pay Paul	spłacenie długu długiem
before you could say Jack Robinson	w mgnieniu oka?
I don't know him from Adam	someone is stranger