Bear Down
WordNet
verb
(1) Exert a force or cause a strain upon
"This tax bears down on the lower middle class"
(2) Exert full strength
"The pitcher bore down"
(3) To make a rush at or sudden attack upon, as in battle
"He saw Jess charging at him with a pitchfork"
(4) Contract the abdominal muscles during childbirth to ease delivery
(5) Exert a force with a heavy weight
"The snow bore down on the roof"