IPA: /ˈʌp.sɔːr/
KK: /ʌpˈsɔr/
To rise or fly high into the air.
The bird began to upsoar into the clear blue sky.
Past: upsoared
Past Participle: upsoared
Upsoar is formed from "up" (meaning to a higher place) and "soar" (from Old English "sōrian", meaning to rise or fly high). The word "upsoar" means to rise or fly high to a greater height.
Think of going 'up' to a 'higher' place — that's what upsoar means.