Patsach (H6476) means to break forth or burst out — particularly in joyful song or shout. It is used almost exclusively for exuberant, uncontainable praise. Appearing about 8 times in the OT, it is concentrated in Isaiah and the Psalms.
Patsach describes praise that cannot be contained — praise that bursts out like a dam breaking. Isaiah uses it repeatedly to envision creation itself crying out at God's redemption (Isa 44:23; 49:13; 55:12). The mountains, forests, and trees 'break forth' in singing when YHWH acts. This word captures the eschatological joy that erupts when God's glory is revealed — a foretaste of the praise of the redeemed.
Patsach is closely linked to ranan (to shout/sing for joy) in parallel clauses. Together they paint a picture of joyful noise filling creation. The word's force is kinetic — breaking through barriers. In the new creation, all of nature participates in the praise of God (Rom 8:19-22). Patsach points to that cosmic crescendo.