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lightheaded

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be light-headed

To feel dizzy, as if one might faint. I'm light-headed because I stood up too quickly. Your mother needs to sit down, she's light-headed all of a sudden.

feel light-headed

To feel dizzy, as if one might faint. I'm feeling light-headed because I stood up too quickly. Your mother needs to sit down because she feels light-headed all of a sudden.

See also: feel

be/feel light-headed

to feel weak and as if you might fall over I feel a bit light-headed. I shouldn't have drunk that second glass of wine.