Questions about example sentences with, and the definition and usage of "Ruddy"

A: It can add emphasis. "You're a ruddy liar."
In old-fashioned English, it means "red in a healthy way". "He had ruddy cheeks."

A: It’s either red or describing the car as something that is not working properly.

A: It's just another way to say 'bloody hell', 'fucking hell', etc. I'm quite sure it's only used in English (UK), but it's understandable nonetheless. It's sort of a swear expression (though not that offensive... like 'hell' rather than 'fuck'), used to express frustration.

A: It means 'she's worked extremely hard'.

'Ruddy' is a word to replace 'bloody' or a swear word, it is lower class slang. It is to emphasise the next word.

'Trojan' refers to the famous Trojan horse, which was pushed by men.
In this saying, it is saying she worked as hard as one of the men pushing the horse.

A: He had a ruddy complexion from working in the open air

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A: We don't use that word here in the states.