IPA: //ˈsʌstə.nəns//
KK: /sʌstəˌnəns/
Something that provides support or nourishment for life, especially food.
The farmer worked hard to ensure there was enough sustenance for his family and animals.
Sustenance → It is formed from "sustinere" (from Latin, meaning to hold up or support) which combines "sub-" (meaning under) and "tenere" (meaning to hold). The word refers to that which supports or sustains life.
Think of something that 'holds up' or 'supports' life — that's what sustenance means.