Not take (something) sitting down verb phrase
To refuse to tolerate or accept something unfortunate, or unjust without resistance, argument, or action
She's the kind of person who won't take something sitting down.
I think he's not going to take this sitting down.
She didn't took his rude behaviour lying down.
To accept an unpleasant situation without making any complaint about it
One is forced to accept something unpleasant or endure an unwanted fact.
To tolerate something unpleasant
Eating some dirty food or putting up with some unpleasant things in your life.
Said when someone accepts a bad situation because that's the way things are