peak of love; lovesick period
Refers to the time when one is most deeply in love, often with a sense of being lovesick or infatuated. Somewhat literary or poetic.
He's at the peak of love right now and can't seem to focus on work.
Young people in the throes of love sometimes lose sight of their surroundings.
Compound of 恋 (こい, 'love') and 盛り (さかり, 'peak, prime'). The reading こいざかり is a standard rendaku (sequential voicing) of さかり.