Aún no tenemos significados para "become lightheaded".
1Only now did she realize that she'd been holding her breath since this display began, and was beginning to become lightheaded.
2My temperature also ran up, and I became lightheaded again.
3I found myself becoming lightheaded.
4He became lightheaded, no longer able to focus enough to read the clock or follow the words passing between the doctor and nurse.
5I suddenly became lightheaded and a bit dizzy, but "Breathe slowly and deeply," said Random, before I could remark on it.