It’s a word of obscure origin — with an original meaning of flapping violently with wings — and a great parallel word “swip”, to hit.

• 4.005 and the wind whipped the rain
• 4.021 Swish, smack! Whip crack!
• 4.022 for now the goblins took out whips
• 4.022 and whipped them with a swish, smack!,
• 4.023 and nearest to the whips)
• 4.023 and cracked their whips behind.