I'll break your legA threatening expression meaning the speaker will break someone's leg. The object is often added after ขา, such as ฉันจะหักขาแก, “I'll break your leg.”
TH: ถ้ายังแกล้งน้องฉันอีก ฉันจะหักขานาย
EN: If you bother my little brother again, I'll break your leg.