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undersurface an underside.
undertake to take on (a task, project, challenge or the like); decide or start to do. [2 definitions]
undertaker one who undertakes something. [2 definitions]
undertaking the act of one who undertakes. [3 definitions]
under the circumstances given the facts as they are.
under-the-counter secret or illegal, as sales or payments; under-the-table.
under the counter secretively, esp. in order to evade the law.
under the hammer offered for sale at public auction.
under the lee the quarter toward which the sea wind is blowing; to leeward.
under the sun in existence; in the world; on earth.
under-the-table of a transaction, done secretly and usu. illegally; under-the-counter.
under the weather (informal) slightly ill or unhappy.
underthings underclothes.
undertone a low or subdued sound, esp. of the voice. [3 definitions]
undertow a strong current or backwash of water moving in the opposite direction from the water on the surface, as beneath waves breaking on a shore.
under tow being moved along by towing.
underuse to use too little of or too infrequently. [2 definitions]
undervalue to place too low a valuation on; underestimate. [2 definitions]
underwater located, occurring, done, or intended for use below the surface of a body of water. [2 definitions]
under way making progress; moving ahead; advancing. [2 definitions]
underwear a garment or garments worn next to the skin under other clothing; underclothes.