a bit off

a bit off

1. Sickly, unwell, or out of sorts, either physically or mentally. You seem a bit off, Jim. Are you feeling all right? That dog on the corner looks a bit off. I think we should walk another way home.
2. Somewhat strange, incorrect, inaccurate, or substandard. A: "The rest of your portrait is coming along really well, but the hands look a bit off." B: "I know, hands are just so hard to draw!" The gameplay is great, but the graphics on the characters' faces are a bit off.
3. Of food, spoiled or rotten. These chicken breasts smell a bit off—I think we should throw them out.
See also: bit, off
Farlex Dictionary of Idioms.

*bit off

 and *little off
a little crazy; a little out of whack. (*Typically: be ~; find someone ~.) This guy's a little off, but he is harmless.
See also: bit, off
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • bit off
  • do (one's) bit
  • do bit
  • do one's bit
  • do your bit
  • bit by bit
  • take a breath
  • in dribs and drabs
  • be champing/chomping at the bit
  • chomp