I'm having trouble understanding of this passage from The Ferryman (Jez Butterworth) What is the meaning of:"been up half the night lying in wait for her"?
UNCLE PAT. She’s been up half the night lying in wait for her. Honing her Battle Plan. I swear to God, sometimes I think the only thing keeping her alive is her hatred for that woman. You watch. Soon as Mrs T starts up, Pat’ll be out of that chair screaming till she’s blue in the bake, and hopefully, she’ll have a massive coronary and drop stone dead on the flagstones there. Let’s face it, it’s how she’d want to go. Me, I don’t care how she goes, just as long as she bloody well does.