Correct spelling, explanation: when we want to create a past participle or past simple of the verb grab, we must add the suffix -ed and double the consonant. It’s worth mentioning that it’s not always the case when it comes to irregular verbs: we need to double the last (and stressed as well) consonant in a basic word if there’s a single vowel before it. Always remember that rule and you won’t make that common mistake. Therefore, the only correct spelling is grabbed, not grabed.

Definition of grabbed:
1. verb (past simple, past participle), to take or seize by or as if by a sudden motion or grasp
Startled by the sudden noise, she grabbed the nearest object for self-defense.
The child eagerly grabbed the ice cream cone, his face lighting up with delight.
2. adjective participle, to quickly take and hold (someone or something) with your hand or arms
The grabbed microphone slipped from his hand as he fumbled with nerves on stage.
The thief dropped the grabbed purse and fled when he realized he had been spotted.

Collocations with grabbed:
Some most commonly used collocations include:
1. Grab the bull by the horns – to take decisive action or confront a difficult situation directly and assertively.
If you want to succeed, you need to grab the bull by the horns and face your fears head-on.
2. Grab a deal – to take advantage of a special offer or discount by quickly making a purchase.
The store is offering a discount on electronics. Let’s go and grab a deal on that new laptop.
3. Grab the spotlight – to become the center of attention or to receive a significant amount of public or media focus.
The talented young singer grabbed the spotlight with her outstanding performance.

Incorrect spelling, explanation: it’s not always enough to just add a specific suffix to the end of a verb in order to create a past simple/past participle form. Sometimes we also have to double the last, stressed consonant – when there is a single vowel before it. That’s why you can’t spell grabbed as grabed – it lacks the double -b letter. One must remember that it consists of three parts: grab + b + ed, so it’s not right to omit any of them. Grabbed is the only correct version of this word.