Definition of sneaker wave in US English:

sneaker wave

noun

North American
  • A very large, powerful coastal wave that approaches the shore suddenly and unexpectedly.

    ‘forecasters warned those headed to the beach to watch out for high surf and sneaker waves’
    • ‘Hey, Rusty, you told us earlier that you were expecting some sneaker waves.’
    • ‘These sneaker waves happen at various degrees every day regardless of whether or how rough the sea is and even during little surf.’
    • ‘Walking along Harris Beach, Oregon I turned to see this 'sneaker wave' roll in.’
    • ‘A sneaker wave crashes in unexpectedly, inundating an unsuspecting eagle with a sudden foam bath.’
    • ‘In early 2004, a person at McClures Beach was killed when she was knocked off a rock by a sneaker wave.’
    • ‘Beware the sneaker wave.’
    • ‘It was a fun time at Christmas and I remember my Dad having great fun when a sneaker wave caught me and soaked me.’