IPA: //ˌʌndərˈstrɛŋkθ//
KK: /ʌndərˈstrɛŋkθ/
Not having enough members or strength, often used to describe a group or unit that is smaller than needed.
The team was understrength due to several injuries, making it difficult to compete effectively.
Understrength → It is formed from "under-" (meaning below or insufficient) and "strength" (from Old English "strengþu", meaning power or force). The word describes a state of being below the normal or required level of strength or power.
Think of being 'below' ('under-') the normal level of 'power' ('strength') — that's why understrength means lacking in strength.