move forward in a threatening manner (e.g., "The cruise ship bore down on our canoe"); use utmost effort and concentration (e.g., "If you really bear down, you will success"); contract the muscles of the abdomen during childbirth in order to facilitate the delivery
BEAR DOWN
Meaning of BEAR DOWN in English
Explanatory English dictionary bed edition. Толковый словарь английского языка Редакция bed. 2012