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Pronunciation varies by accent · adjective
Of sunglasses: having lenses that can be pushed upward and out of the frame, so that the glasses need not be removed in darker areas such as indoors..
Use flip-up when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Flip-up means Of sunglasses: having lenses that can be pushed upward and out of the frame, so that the glasses need not be removed in darker areas such as indoors..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use flip-up where its definition matches the intended context.
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