lour (also lower)

v [I, Ipr] ~ (at/on sb/sth) (a) look threatening; frown 作怒相; 皱眉: louring looks 怫然不悦的神情. (b) (of the sky, clouds, etc) look dark, as if threatening a storm （指天气、 云等）变阴暗（似预示暴风雨）.

lots and lots, lots of, lottery, lotto, lotus, lotus position, loud, loud-mouth, loud-mouthed, loudhailer, loudly, loudness, loudspeaker, loudspeaker (also speaker), lough, Louis Pasteur, lounge, lounge bar (Brit) (US saloon bar), lounge-suit, lounger, louse, lousy, lout, loutish, louvre (also louver), louvred (also louvered), lovable, love, love affairs, love-affair, love-bird, love-child, love-hate, love-letter, love-making, love-match, love-potion (also love-philtre), love-seat, love-song, love-story,