first part of a poem; first part of a verse
Refers to the opening section of a poem, especially in traditional forms like waka or renga. Often contrasted with 下の句 (しものく, the latter part).
See also: 上の句
Hearing the first part of a Hyakunin Isshu poem, I recall the latter part.
Compound of 上 (かみ, upper) and 句 (く, phrase/verse). The reading かみく follows standard rendaku patterns.