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Pronunciation varies by accent · noun
a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide.
Use tidemark when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Tidemark means a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use tidemark where its definition matches the intended context.
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