ph.

1. 严厉批评;斥责;贬低
If you run people or things down, you criticize them strongly.

2. 压缩;削减;减少
If people run down an industry or an organization, they deliberately reduce its size or the amount of work that it does.

3. 减少;降低
If someone runs down an amount of something, they reduce it or allow it to decrease.

4. （车辆）把…撞伤，撞倒
If a vehicle or its driver runs someone down, the vehicle hits them and injures them.

5. (机器或设备等)逐渐损耗，效能降低
If a machine or device runs down, it gradually loses power or works more slowly.

6. see also: run-down

1. use up all one's strength and energy and stop working

e.g. At the end of the march, I pooped out

Synonym: poop outpeter outrun outconk out

2. injure or kill by running over, as with a vehicle

Synonym: run over

3. pursue until captured

e.g. They ran down the fugitive

4. move downward

e.g. The water ran down

5. examine hastily

e.g. She scanned the newspaper headlines while waiting for the taxi

Synonym: scanskimrakeglance over

6. deplete

e.g. exhaust one's savings
We quickly played out our strength

Synonym: exhaustplay outsaptire

7. trace

e.g. We are running down a few tips

Synonym: check out