noun🔗ShareA line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide"After the storm, a dark tidemark of seaweed showed how high the waves had reached on the beach. "environmentgeographygeologynatureoceannauticalplaceweatherChat with AIVocabulary GamePractice Reading
noun🔗Share(by extension) any mark showing the limit of some past activity"The stack of unread emails on my boss's desk formed a clear tidemark of how busy he'd been last week. "markpasthistoryChat with AIVocabulary GamePractice Reading
noun🔗ShareA line of scum left on a bath tub when the water is drained away"After my long bath, a dirty tidemark was left around the tub. "appearanceutilityenvironmentmarkChat with AIVocabulary GamePractice Reading
