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1907, glahm "grab, snatch, steal," American English underworld slang, from Scottish glaum (1715), apparently from Gaelic glam "to handle awkwardly, grab voraciously, devour." Sense of "look at, watch" (1945) apparently is derived from the same source. Related: Glommed; glomming.
[1907+ Underworld & hoboes; fr British dialect glaum, glam, ''hand,'' ultimately fr Old English clamm, ''bond, grasp,'' related to clamp]