【overturn】 —turn upside down; fall over:

• Pollock’s car crashed into a clump of trees and overturned.

【turn over】 —

1. = 【overturn】 :

• It was less than a hundred feet from the crossing when the car turned over and threw out the two occupants.

2. turn oneself to face the other way:

• I heard the clock, but then I turned over and went back to sleep.

3. (of an activity) continue at a usual or slow speed:

• After a good start, the organization is now just turning over, and is in need of fresh ideas.

4. (of goods) be sold or disposed of:

• In a grocery store, milk turns over more rapidly than, say, canned asparagus.

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