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

bite off

To use the teeth to pull off something. A noun or pronoun can be used between "bite" and "off." We had to take the dog to the vet after he bit off and ate a piece of a questionable-looking plant. Once the lollipop was soft enough, I bit it off the stick
See also: bite, 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:
  • a 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
  • champ
  • be champing at the bit
References in classic literature
With his teeth, he bit off the paw of his front foot and threw it at that poor beast, so that he might have something to eat."
ha!--goin' to get married and the rest-- thought you might be unstrung, eh, a trifle?--nerves just a bit off, you know.
But he liked to think how Laura would put out her lips and her tiny hands for the bits of sugarcandy; and to give the greater keenness to these pleasures of imagination, he took out the parcel, made a small hole in the paper, and bit off a crystal or two, which had so solacing an effect under the confined prospect and damp odors of the gig-umbrella, that he repeated the process more than once on his way.
She threw the package into the stove, but I bit off a corner of one of the chips I held in my hand, and chewed it tentatively.
Not deriving from these means the relief which he sought, he bit off an immense mouthful from the bread and meat, and took a quick drink of the porter; by which artificial aids he choked himself and effected a diversion of the subject.
Is very much scarred about the face and body, and has the left ear bit off.'
So Phebe sat demurely in her place while her new teacher laid forth books and slates, a pretty inkstand and a little globe; hastily tore a bit off her big sponge, sharpened pencils with more energy than skill, and when all was ready gave a prance of satisfaction that set the pupil laughing.
Thou art like to achieve fame, Will, let me tell thee, for there will be many a merry ballad sung about the country, and many a merry story told in Sherwood of how Robin Hood taught Little John and Arthur a Bland the proper way to use the quarterstaff; likewise, as it were, how our good master bit off so large a piece of cake that he choked on it."
"I guess we've bit off more'n we could chew," he admitted to Saxon.
His hearing was a bit off, but he could foller you if you spoke to him nice and clear.
HARRY Styles says he got so high on magic mushrooms that he bit off part of his tongue.
The Independent Police Oversight Authority is probing a deputy OCS who allegedly assaulted a woman and bit off her left ear.
A Texas man accused of driving under the influence (DUI) bit off a part of an arresting officer's ear Friday evening, according to the police authorities.
"I knew Blaine was a little bit off because he didn't say anything in the warm-up and usually he's full of beans.
Ms Reeve, who works for Newcastle City Council, said it all felt "a bit off", but thrown off by the unexpected approach and wanting to be polite, she began to write her name on the street.