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Từ điển WordNet v3.1 - WordNet Dictionary
free fall


noun
1. the ideal falling motion of something subject only to a gravitational field
Hypernyms:
drop, fall
2. a sudden sharp decrease in some quantity
- a drop of 57 points on the Dow Jones index
- there was a drop in pressure in the pulmonary artery
- a dip in prices
- when that became known the price of their stock went into free fall
Syn:
drop, dip, fall
Derivationally related forms:
fall (for: fall), drop (for: drop)
Hypernyms:
decrease, decrement
Hyponyms:
correction, voltage drop


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