HUM (2)

hum (2). Hum, n. a low noise, a deception

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Hum, v. t. 1. 1. To sing with shut mouth; to murmur without articulation; to mumble; as, to hum a tune.
2. 2. To express satisfaction with by humming.
3. 3. To flatter by approving; to cajole; to impose on; to humbug.