Ecclesiastes 12:4

4. doors--the lips, which are closely shut together as doors, by old men in eating, for, if they did not do so, the food would drop out (Job 41:14; Psa 141:3; Mi 7:5). in the streets--that is, toward the street, "the outer doors" [Maurer and Weiss]. sound of ... grinding--The teeth being almost gone, and the lips "shut" in eating, the sound of mastication is scarcely heard. the bird--the cock. In the East all mostly rise with the dawn. But the old are glad to rise from their sleepless couch, or painful slumbers still earlier, namely, when the cock crows, before dawn (Job 7:4) [Holden]. The least noise awakens them [Weiss]. daughters of music--the organs that produce and that enjoy music; the voice and ear.

Robert Jamieson, A. R. Fausset & David Brown, 1871 · public domain

Verse 4 And the doors shall be shut in the streets - 5. The doors - the lips, which are the doors by which the mouth is closed. 6. Be shut in the streets - The cavities of the cheeks and jaws, through which the food may be said to travel before it is fitted by mastication or chewing to go down the aesophagus into the stomach. The doors or lips are shut to hinder the food in chewing from dropping out; as the teeth, which prevented that before, are now lost. 7. The sound of the grinding is low - Little noise is now made in eating, because the teeth are either lost, or become so infirm as not to nsuffer their being pressed close together; and the mouth being kept shut to hinder the food from dropping out, the sound in eating is scarcely heard. The teeth are divided into three kinds: - 1. The dentes incisores, or cutting teeth, in the front of the jaw. 2. The dentes canini, or dog teeth, those in the sides of the jaws, for gnawing, or tearing and separating hard or tough substances. And, 3. Dentes molares, or grinding teeth, the posterior or double teeth, in both jaws, generally termed the grinders; because their office is to grind down the substances that have been cut by the fore teeth, separated into their parts or fibres by the dog teeth, and thus prepare it for digestion in the stomach. 8. He shall rise up at the voice of the bird - His sleep is not sound as it used to be; he slumbers rather than sleeps; and the crowing of the cock awakes him. And so much difficulty does he find to respire while in bed, that he is glad of the dawn to rise up and get some relief. The chirping ot the sparrow is sufficient to awake him. 9. All the daughters of music shall be brought low - The Voice, that wonderful instrument, almost endless in the strength and variety of its tones, becomes feeble and squeaking, and merriment and pleasure are no more. The tones emitted are all of the querulous or mournful kind.

Adam Clarke, 1831 · public domain