Noun, Noun which may take the genitive case particle 'no'
rising rapidly (e.g. prices, popularity); soaring; skyrocketing; going through the roof
営業成績はまさに鰻上り、というところかね。Our sales performance is just skyrocketing.
Also written うなぎ上り【うなぎのぼり】、鰻登り【うなぎのぼり】、鰻上り【うなぎのぼり】