What does allonge mean?
The definition of allonge
Al*longe”, n.
Etym: [F. allonge, earlier alonge, a lengthening. See Allonge, v., and cf. Lunge.]

1 (Fencing)
A thrust or pass; a lunge.
2 A slip of paper attached to a bill of exchange for receiving indorsements, when the back of the bill itself is already full; a rider. [A French usage] Abbott.

Al*longe”, v. i.
Etym: [F. allonger; à (L. ad) + long (L. longus) long.]

To thrust with a sword; to lunge.