To save someone or something from trouble.
save someone's life
To prevent someone from getting into trouble, or to rescue them from i …
woe betide
Used to warn someone that trouble will occur if that person does somet …
problem child
Someone or something persistently difficult or vexing; a frequent sour …
square peg in a round hole
Someone or something that does not fit well or at all in a certain set …
know inside and out
To know (something or someone) very thoroughly.
paper tiger
Something or someone that appears powerful, strong or threatening but …