Assyria also has joined with them;
They have become a help to the children of Lot.
Selah.
Psalms 83:8

Wait. The complaint against their enemies has been lodged, names have been given. A breath or a pause is now exercised to maintain control of thought and wits. Sort of like the shock upon learning the condition of Job. (Job 2:13) This might be a good practice in these troubling days.

The following is taken directly from The Treasury of David by Spurgeon.

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EXPOSITION

Assur is also joined with them. It was then a rising power, anxious for growth, and it thus early distinguished itself for evil. What a motley group they were; a league against Israel is always attractive, and gathers whole nations within its bonds. Herod and Pilate are friends, if Jesus is to be crucified. Romanism and Ritualism make common cause against the gospel.

They have holpen the children of Lot. All these have come to the aid of Moab and Ammon, which two nations were among the fiercest in the conspiracy. There were ten to one against Israel, and yet she overcame all her enemies. Her name is not blotted out; but many, nay, most of her adversaries are now a name only, their power and their excellence are alike gone.

Selah. There was good reason for a pause when the nation was in such jeopardy: and yet it needs faith to make a pause, for unbelief is always in a hurry.

EXPLANATORY NOTES AND QUAINT SAYINGS

Assur also, etc. This determines the date of this Psalm to the latter times of the Jewish kingdom; for the other nations here mentioned had molested them before, but the Assyrians not till towards the end. — William Wall, 1645 or 1646-1727-8.