Jamieson, Fausset and Brown on Isaiah 23:2

2. Be still--"struck dumb with awe." Addressed to those already in the country, eye-witnesses of its ruin (La 2:10); or, in contrast to the busy din of commerce once heard in Tyre; now all is hushed and still.

isle--strictly applicable to New Tyre: in the sense coast, to the mainland city, Old Tyre (compare Is 23:6; Is 20:6).

Zidon--of which Tyre was a colony, planted when Zidon was conquered by the Philistines of Ascalon. Zidon means a "fishing station"; this was its beginning.

replenished--with wealth and an industrious population (Eze 27:3, 8, 23). Here "Zidon," as the oldest city of Phoenicia, includes all the Phoenician towns on the strip of "coast." Thus, Eth-baal, king of Tyre [Josephus, Antiquities, 8.3,2], is called king of the Sidonians (1Ki 16:31); and on coins Tyre is called the metropolis of the Sidonians.