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Basic Trope: A character lies to explain away suspicious injuries.
Straight: Bob has injuries from a brutal fight. When asked about his bruises, Bob lies that and says that he got them in a game of football that got rough.
Bob gets his arm chopped off. Bob explains it away as him severing it himself during a fencing lesson.
Bob gets severely beaten and explains that he fell down three stories of stairs.
Alice walks in on Bob getting severely beaten and Bob says he tripped and faceplanted.
Downplayed: Bob has a small bruise on his arm from being hit and explains it by saying that he hit it on a counter top when asked.
Justified: A character was in a place or does something that they want nobody else to know about, so anything that may be relating to the secret is brushed off. May be done more carefully to avoid being mistaken as the above justification.
Bob tells everyone that he was beaten up, but everyone assumes that he got his injuries in a particularly rough game of football.
Bob really did injure himself playing football, but everyone thinks someone beat him.
Subverted: The audience and/or the other characters are led to believe that Bob's reason for a bruise is that he was beaten, but Bob then reveals that he was hurt by something else.
Double Subverted: It turns out someone did beat him; the beating just isn't the cause of that particular bruise.
Bob just beat up a gang of bikers. When asked about his battle scar the next day, he explains that the he stepped on a cat's tail.
Bob has a slight cut on his cheek due to shaving, but Alice assumes a Yandere with an axe tried to hurt him, and has hysterics over the supposed incident
Zig Zagged: Bob shows up with bruises that he explains away as being from a game of football. It turns out that this would be correct, but someone did beat him, but not where it would show.
Bob really does play football, and it's known he got himself injured playing football.