17. Meaning rough or rude and signaled to mark wildness in a mare, the Spanish term "broncho" was generally used for any untamed horse or any untamed breed of man who went unshaven and unshod.
Ans: Meaning rough or rude and signaling wildness in a mare, the Spanish term "broncho" was generally used for any untamed horse or any untamed breed of man who went unshaven and unshod.
The compound construction is a compound participial phrase. The "-ing" words must be paired. This requires dropping "to mark" in order to make the best sense in the sentence.