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Use "thwartwise" in a sentence
"There was a trough running thwartwise of the ship into which the water had to be lifted from the midship well."
"But only stoop -- catch the light thwartwise -- and all is a silver network of gossamer!"
"So we sheered off together, arm-in-arm, so to speak; and with fullest confidence I took the jigging, thwartwise course my chainless pilot laid for me."