bear down (Verb) — Exert a force with a heavy weight. ex. "The snow bore down on the roof"
bear down (Verb) — Contract the abdominal muscles during childbirth to ease delivery.
bear down (Verb) — To make a rush at or sudden attack upon, as in battle. ex. "he saw Jess bearing down at him with a pitchfork"
bear down (Verb) — (baseball) exert full strength. ex. "The pitcher bore down"
bear down (Verb) — Pay special attention to. ex. "The lectures bore down on the political background"
bear down (Verb) — Exert a force or cause a strain upon. ex. "This tax bears down on the lower middle class"
bear down (Adjective) — With full strength. ex. "his beardown performance in the exhibition game"