B1
to notice or understand something that you did not notice or understand before
Dictionary examples:
I suddenly realized my pants were on backwards during my job interview! (0.0)
I realized I'd been wearing my shirt inside out all day at work. (0.0)
I suddenly realized I'd been using my roommate's toothbrush for a month! (0.0)
They didn't realize the danger they were in. (20.4)
I didn't realize how unhappy she was. (22.1)
I suddenly realized I'd met her before. (31.9)
Do you realize that this is the third time you've forgotten? (44.6)