Blow has a few common slang meanings, depending on context. Here are the main ones you’ll encounter:

• To fail or mess up
  • Example: “She really blew her presentation.” This use is common in everyday English and often implies an important mistake or poor performance.

• To use or deal with cocaine
  • “Blow” is widely used as slang for cocaine in many English-speaking regions. Other related terms include coke, snow, and nose candy.

• A forceful action or impact
  • In slang, a “blow” can refer to a strong hit or shock, as in “take a blow” or “blow to the reputation.” This aligns with more general senses of blow as a sudden event or strike.

• To exhale or remove air
  • In more literal, non-slang uses, it means to expel air, such as blowing out a candle or blowing wind. This sense is widely understood and non-offensive.

Notes on usage:

• The cocaine meaning is informal and can be considered vulgar in some settings, so be mindful of audience and context.

• The “fail/mess up” sense is broadly used in both spoken and informal written English, including work or school contexts.

If you’d like, I can tailor examples for a specific context (casual conversation, academic writing, or a media review) or translate a few sample sentences into your target dialect.