bear down
bear down {v.}
1. To press or push harder; work hard at; give full strength and attention.
She is bearing down in her studies to win a scholarship.
The baseball pitcher is bearing down.
The pitcher bore down on the star batter.
Teachers of the deaf bear down on English.
The sergeant bears down on lazy soldiers.
Contrast: LET UP (2b).
2. To move toward in an impressive or threatening way. — Often used with "on".
While he was crossing the street a big truck bore down on him.
The little ship tried to escape when the big pirate ship bore down.
After the boys threw the snowballs they saw a large lady bearing down upon them from across the street.
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Source: A Dictionary of American Idioms