IPA: //ˈwɛltərweɪt//
KK: /ˈwɛltərˌweɪt/
A person who competes in boxing or other sports at a specific weight limit, which is usually up to 147 pounds (66.1 kilograms).
The welterweight champion defended his title in a thrilling match last night.
Welterweight is formed from "welter" (from Old English *wealtra*, meaning to roll or tumble) and "weight" (from Old English *wiht*, meaning a measure of heaviness). The term refers to a weight class in boxing where competitors are typically heavier than lightweight but lighter than middleweight, suggesting a category of fighters who 'tumble' or 'roll' in the ring.
Think of 'welter' meaning to roll or tumble, which helps you remember that 'welterweight' refers to a boxing class where fighters are in a specific weight range, rolling into action.