[f. CO- + ALLY sb.] (See quot.)

1

1828.  Webster, Co-ally, a joint ally; as, the subject of a co-ally. Kent.

2

  So Co-allied ppl. a.

3

1740.  Warburton, Div. Legat., Ded to Jews, Such Civil society can never … honourably act with a total disregard to that co-allied Religion, which they profess to believe.

4