| Tools to study difficult words | Show Helper | 
| Hard TOEFL Words - Group 3 | View Group Words | 
|   New    Known    Review | 
| collateral | 
|     | 
| n. guarantee, usually in the form of an asset, for the repayment of a loan if one cannot procure enough funds to repay | 
|   New    Known    Review | 
| collider | 
|     | 
| n. accelerator in which two beams of particles are forced to collide head on | 
|   New    Known    Review | 
| colloquialism | 
|     | 
| n. colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech |