This is a “French” word, now used in English that is referred to when a line in a poem flows into another without any punctuation such as commas,full stops or even seimi colons.
“nettles” by Vernon Scannell has great examples of emjambment
“But in two weeks,the busy sun and rain
Had called up tall recuits behind the shed:”
“But in two weeks,the busy sun and rain
Had called up tall recuits behind the shed:”
by It’s real January 02, 2018