פירוש על תענית 45:4

Ugah: A circular line; like a cake, which is round.

In the manner that Habakkuk did: As is explained in the Targum on Habakkuk on, "I will stand upon my watch" - he made a type of prison and sat [there].

In the manner that Habakkuk did, etc.: As everyone who prays stands in one place! But since it is written about him with a double expression - "I will stand and set myself, etc." - it implies that he made a circle in the place that he prayed, so that he not move from there until he was answered. And an ugah is a circular line, like Rashi explained. And he was called Choni HaMe’aggel based on this; meaning that he encircled himself with a circular line.