Sentence:  Dandy Marx, a perfect gentleman in the true sense of the word, now drives forth under single harness ; whereas “once upon a time,” he rushed over the ground at a “big <WSD>lick</WSD>,” reigning his four beautiful roans, and continually kicking up an extra excitement among the “fashionables.” 
Meaning of the word marked with <WSD> tags:  A rate of speed. (Always qualified by '''good''', '''fair''', or a similar adjective.)