What does sub-surface mean?
Sub-surface means Alternative spelling of subsurface..
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Pronunciation varies by accent · adjective
Alternative spelling of subsurface..
The next two stages of new signalling equipment went live on London Underground's sub-surface lines at the beginning of September.
Use sub-surface when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sub-surface means Alternative spelling of subsurface..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The next two stages of new signalling equipment went live on London Underground's sub-surface lines at the beginning of September.
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