To begin to love
This idiom is used with the expression at first sight to indicate a sudden interest in love.
Начать испытывать любовь; влюбиться.
Ben and Sal fell in love in high school, and got married after graduation.
Have you ever fallen in love at first sight?
He had never seen that young lady, only her portrait, but he fell in love with her as soon as he met her.
Он никогда не видел эту девушку, только её портрет, но влюбился сразу же, как только встретил её.
The man fell in love with a woman from his university class and they got married several months later.
Мужчина влюбился в свою университетскую однокурсницу и они поженились спустя несколько месяцев.