From an unused root meaning to devour; a kind of locust -- palmer-worm.
H1501. gazam
גָּזָם noun masculineAmos 4:9 locusts (collective) — absolute גָּזָם Joel 1:4; 2:25; Amos 4:9; — always as devouring, devastating, Joel 1:4 ("" חָסִיל יֶלֶק, אַרְבֶּה,) 2:25 ("" id.); Amos 4:9 alone: your gardens and your vineyards, and your fig-tres and your olive-trees הַגָּזָם יאֹכַל.