اصطلاحات

Be at the bottom of = to be cause of something, usually something bad.
 (علت ‏وقوع یک حادثه ی بد)

Mark something up or down = to reduce or raise the price of something.

(کم کردن و بالا ‏بردن قیمت چیزی)

Until / till / to the bitter end = to the limit of one's efforts / to the last extremit.

(تا آخرین توان؛ نهایت سعی و توان)