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 …