ירמיהו ד:ה פירוש: רש״י

and say, “Sound a shophar...” Warn the inhabitants of the land that they sound the shophar to flee.

assemble Heb. מלאו. An expression of gathering, and there are many in the Scriptures: (Isaiah 31: 4) “Although a band of (מְלֹא) shepherds gather against him,” Also (infra 12:6) “They called after you a band (מָלֵא).” Also (Job 16:10) “Together they gather (יתמלאוּן) against me.”