| 1. | (in the distillation of petroleum or the like) the process of breaking down certain hydrocarbons into simpler ones of lower boiling points by means of excess heat, distillation under pressure, etc., in order to give a greater yield of low-boiling products than could be obtained by simple distillation. Compare catalytic cracking. |
| 2. | extremely; unusually: We saw a cracking good match at the stadium. |
| 3. | done with precision; smart: A cracking salute from the honor guard. |
| 4. | get cracking. crack (def. 53). |
| 1. | to break without complete separation of parts; become fissured: The plate cracked when I dropped it, but it was still usable. |
| 2. | to break with a sudden, sharp sound: The branch cracked under the weight of the snow. |
| 3. | to make a sudden, sharp sound in or as if in breaking; snap: The whip cracked. |
| 4. | (of the voice) to break abruptly and discordantly, esp. into an upper register, as because of weariness or emotion. |
| 5. | to fail; give way: His confidence cracked under the strain. |
| 6. | to succumb or break down, esp. under severe psychological pressure, torture, or the like: They questioned him steadily for 24 hours before he finally cracked. |
| 7. | Chemistry. to decompose as a result of being subjected to heat. |
| 8. | Chiefly South Midland and Southern U.S. to brag; boast. |
| 9. | Chiefly Scot. to chat; gossip. |
| 10. | to cause to make a sudden sharp sound: The driver cracked the whip. |
| 11. | to break without complete separation of parts; break into fissures. |
| 12. | to break with a sudden, sharp sound: to crack walnuts. |
| 13. | to strike and thereby make a sharp noise: The boxer cracked his opponent on the jaw. |
| 14. | to induce or cause to be stricken with sorrow or emotion; affect deeply. |
| 15. | to utter or tell: to crack jokes. |
| 16. | to cause to make a cracking sound: to crack one's knuckles. |
| 17. | to damage, weaken, etc.: The new evidence against him cracked his composure. |
| 18. | to make mentally unsound. |
| 19. | to make (the voice) harsh or unmanageable. |
| 20. | to solve; decipher: to crack a murder case. |
| 21. | Informal. to break into (a safe, vault, etc.). |
| 22. | Chemistry. to subject to the process of cracking, as in the distillation of petroleum. |
| 23. | Informal. to open and drink (a bottle of wine, liquor, beer, etc.). |
| 24. | a break without complete separation of parts; fissure. |
| 25. | a slight opening, as between boards in a floor or wall, or between a door and its doorpost. |
| 26. | a sudden, sharp noise, as of something breaking. |
| 27. | the snap of or as of a whip. |
| 28. | a resounding blow: He received a terrific crack on the head when the branch fell. |
| 29. | Informal. a witty or cutting remark; wisecrack. |
| 30. | a break or change in the flow or tone of the voice. |
| 31. | Informal. opportunity; chance; try: Give him first crack at the new job. |
| 32. | a flaw or defect. |
| 33. | Also called rock. Slang. pellet-size pieces of highly purified cocaine, prepared with other ingredients for smoking, and known to be especially potent and addicting. |
| 34. | Masonry. check 1 (def. 41). |
| 35. | a mental defect or deficiency. |
| 36. | a shot, as with a rifle: At the first crack, the deer fell. |
| 37. | a moment; instant: He was on his feet again in a crack. |
| 38. | Slang. a burglary, esp. an instance of housebreaking. |
| 39. | Chiefly British. a person or thing that excels in some respect. |
| 40. | Slang: Vulgar. the vulva. |
| 41. | Chiefly Scot. conversation; chat. |
| 42. | British Dialect. boasting; braggadocio. |
| 43. | Archaic. a burglar. |
| 44. | first-rate; excellent: a crack shot. |
| 45. | with a cracking sound. |
| 46. | crack down, to take severe or stern measures, esp. in enforcing obedience to laws or regulations: The police are starting to crack down on local drug dealers. |
| 47. | crack off, to cause (a piece of hot glass) to fall from a blowpipe or punty. |
| 48. | crack on, Nautical.
|
| 49. | crack up, Informal.
|
| 50. | crack a book, Informal. to open a book in order to study or read: He hardly ever cracked a book. |
| 51. | crack a smile, Informal. to smile. |
| 52. | crack wise, Slang. to wisecrack: We tried to be serious, but he was always cracking wise. |
| 53. | fall through the cracks, to be overlooked, missed, or neglected: In any inspection process some defective materials will fall through the cracks. Also, slip between the cracks. |
| 54. | get cracking, Informal.
|

crack (krāk) v. cracked, crack·ing, cracks v. intr.
Excelling in skill or achievement; first-rate: a crack shot; a crack tennis player. Phrasal Verbs: crack down To act more forcefully to regulate, repress, or restrain: The police cracked down on speeding. crack up Informal
crack downTo act more forcefully to regulate, repress, or restrain: The police cracked down on speeding. crack up Informal
Idiom(s): crack the whipTo behave in a domineering manner; demand hard work and efficiency from those under one's control. [Middle English craken, from Old English cracian; see gerə-2 in Indo-European roots.] |
crack
|
| cracking (krāk'ĭng) Pronunciation Key
The process of breaking down complex chemical compounds by heating them. Sometimes a catalyst is added to lower the amount of heat needed for the reaction. Cracking is used especially for breaking petroleum molecules into shorter molecules and to extract low-boiling fractions, such as gasoline, from petroleum. See also hydrocracking. |
cracking
cracker