When you are with others, do not say you have to use the toilet. Nobody wants to know what you are going to do in there!
Instead of saying toilet, you should say restroom, washroom, or bathroom instead. It is not very ladylike to announce to people your need to use the toilet, especially if you are a woman.
"Where is the toilet?"
"I'll be right back. I need to use the toilet."
"Can you show me where the toilet is?"
"Excuse me, where is the washroom?"
"I'll be right back. I need to freshen up."
"Excuse me, can you show me where the restroom is?"
It is customary in Western culture to say: "May I be excused?" while seated for dinner in very formal situations before you leave to the restroom. Women also often use the expression: "I need to freshen up." This gives the impression that all you will do in the restroom is fix your hair or check your make-up instead of actually using the restroom. Nobody wants to imagine you sitting on a toilet!
1.) "blessing in disguise": When something good happens to you that initially seemed bad.
"Losing my job was a blessing in disguise. I would have never thought I would find a higher paying job so quickly!"
2.) "rule of thumb": Is a general unwritten rule for whatever you are talking about.
"As a rule of thumb, men should always pay for the first date."
"As a rule of thumb, you should measure twice, and cut once."