'To lose the fang' definitions:

Definition of 'To lose the fang'

From: GCIDE

Fang \Fang\, n. [From Fang, v. t.; cf. AS. fang a taking, booty, G. fang.]
1. (Zool.) The tusk of an animal, by which the prey is seized and held or torn; a long pointed tooth; esp., one of the usually erectile, venomous teeth of serpents. Also, one of the falcers of a spider. [1913 Webster]
Since I am a dog, beware my fangs. --Shak. [1913 Webster]
2. Any shoot or other thing by which hold is taken. [1913 Webster]
The protuberant fangs of the yucca. --Evelyn. [1913 Webster]
3. (Anat.) The root, or one of the branches of the root, of a tooth. See Tooth. [1913 Webster]
4. (Mining) A niche in the side of an adit or shaft, for an air course. --Knight. [1913 Webster]
5. (Mech.) A projecting tooth or prong, as in a part of a lock, or the plate of a belt clamp, or the end of a tool, as a chisel, where it enters the handle. [1913 Webster]
6. (Naut.) (a) The valve of a pump box. (b) A bend or loop of a rope. [1913 Webster]
In a fang, fast entangled.
To lose the fang, said of a pump when the water has gone out; hence:
To fang a pump, to supply it with the water necessary to make it operate. [Scot.] [1913 Webster]