Meaning

• To wait in expectation of some event; to make ready.

  "Please stand by for more instructions."

• To remain loyal or faithful to.

  "Even though money is scarce sometimes, Ann stands by her decision to be a full-time mother."

• To support; to continue to support despite things being bad.

  "They stood by us all along and it's awesome to see them out here to support us today."

• To do nothing. To be inactive in a situation.

  "I can't simply stand by and watch you ruin your life."

• To be ready to provide assistance if required.

  "The tug stood by in case it was needed."