ppl. a. [UNDER-1 4 a, 10 a.]
† 1. Imperfectly shut. Obs.–1
1632. J. Hayward, trans. Biondi’s Eromena, 17. So vigilant was the villanous Prodotima, who (expecting him, with the doore under-shut) suddenly leade him the way in.
2. Mech. (See quot.)
1875. Knight, Dict. Mech., 2680/2. Under-shut-valve, one placed beneath the sole-plate of a pump or other object, and not upon it; shutting underneath by an upward motion.
