Knuckle under and Pull out

Knuckle under verb - To cease resistance (as to another's arguments, demands, or control).

Pull out and knuckle under are semantically related. In some cases you can use "Pull out" instead a verb "Knuckle under".

Pull out verb - To leave a place often for another.

Knuckle under and pull out are semantically related. Sometimes you can use "Knuckle under" instead a verb "Pull out".