"With a grain of salt" means to not take something completely seriously or to be skeptical.
It fits the context of doubting a liar's statement.
Barking Dogs never Bite
جو گرجتے ہیں وہ برستے نہیں
بھونکنے والے کتے کبھی نہیں کاٹتے
"To back out" means to withdraw from a commitment or plan.
It involves retreating from a situation one initially intended to proceed with.
Make hay while the sunshines means make maximum use of a given opportunity
دھوپ کے دوران گھاس بنائیں کا مطلب ہے کہ دیے گئے موقع کا زیادہ سے زیادہ استعمال کریں۔
The completed proverb is: "A watched pot never boils."
This proverb means that when you are anxiously waiting for something to happen, it can seem to take longer than it actually does
To have sticky fingers is an idiom.
To have sticky fingers means چوری کی عادت
"Fly in the face of" means to openly oppose or go against something, especially tradition or accepted norms.
The phrase fits the context of defying established traditions.
The idiom "at sea" means to be confused or uncertain about something.
The completed proverb is: "A leopard cannot change its spots."