Webster's Revised Unabridged Dictionary · 1913

Allonge

Allonge ({not transcribed}) , noun

[French allonge, earlier alonge, a lengthening. See Allonge, v., and compare 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

Allonge , intransitive verb

[French allonger; à (Latin ad) + long (Latin longus) long.]

To thrust with a sword; to lunge.