love at first sight, An immediate attraction to someone or something upon first seeing them.
puppy love, A youthful, innocent, and temporary infatuation.
Word Origin
Language
Old English
Original word
lufu
Originally meant
affection, desire, warm attachment
Background
Cognate with Old High German luba and Gothic lubains, all from Proto-Germanic *lubē. The word has retained its core meaning across more than a thousand years of English.