Bear left means the road will slightly curve left, but not a 90 degree turn, just a slight turn, where there will be also a choice to go straight or perhaps turn right. You are supposed to bear left with the road slightly and not take the other options. Keep left means to stay in the left lane, or the left turning lanes, and turn with the left lane if it separates from the other lanes. If you were supposed to make an extreme left turn, they would not say "bear left". The instruction would be "turn left" at the intersection. There will be other instructions to follow that will get you to your destination.

Keep left-stay in the left hand lane. Bare left- turn left.

Oh, it could mean so many things: 1. "Bear left!": Watch out, there's a bear on your left! (statement) 2. "Bare left!": Show you naked self to the left! (imperative) 3. "Bear left": A man called Bear, or maybe a Teddy Bear, who was hanging around that area simply had enough and got up and left. (statement) 4. "Bear left": Head towards the left, take the road on the left (imperative) Hmm, I'm not sure which one it could be though.

Thanks claire for your reminding..

It is bear left [ keep to the left side of the road. "Bare"= nude