jump to conclusions, to

jump to conclusions

To make decisions or form opinions before one has all the pertinent facts. I know you found some suspicious things in her office, but don't jump to conclusions—talk to her first.
See also: conclusion, jump
Farlex Dictionary of Idioms.

jump to conclusions

 and leap to conclusions
Fig. to judge or decide something without having all the facts; to reach unwarranted conclusions. (See also rush to conclusions.) Now don't jump to conclusions. Wait until you hear what I have to say. Please find out all the facts so you won't leap to conclusions.
See also: conclusion, jump
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

jump to conclusions

COMMON If someone jumps to conclusions, they decide too quickly that something is true, when they do not know all the facts. Forgive me. I shouldn't be jumping to conclusions. Note: You can also say that someone jumps to a conclusion. I didn't want her to jump to the conclusion that the divorce was in any way her fault. Note: People sometimes use leap instead of jump. The medical establishment was careful not to leap to conclusions.
See also: conclusion, jump
Collins COBUILD Idioms Dictionary, 3rd ed.

jump (or leap) to conclusions (or the conclusion that)

form an opinion hastily, before you have learned or considered all the facts.
See also: conclusion, jump
Farlex Partner Idioms Dictionary

jump to conclusions, to

To draw inferences too hastily from insufficient evidence. Also put in the singular (to jump to a conclusion), this cliché dates from about 1700.
See also: jump
The Dictionary of Clichés by Christine Ammer
See also:
  • jump to a conclusion
  • jump to conclusions
  • jump/leap to conclusions
  • leap to conclusions
  • rush to conclusions
  • give (one) the low-down
  • give somebody/get the low-down
  • get the low-down
  • fishy
  • thing or two