Meaning of “grab” - Learner’s Dictionary

grab

verb [ T ] us uk /ɡræb/ present participle grabbing, past tense and past participle grabbed
He reached out and grabbed her arm.Somebody grabbed me from behind.She grabbed hold of the rail to steady herself.She grabbed me by the arm.I grabbed a few things and dashed out of the house.
TAKE SUDDENLY

B1 to take hold of something or someone suddenly:

He grabbed my arm and pulled me away.
DO QUICKLY informal

to eat, do, or get something quickly because you do not have much time:

I grabbed a sandwich on the way to the station.
grab sb's attention informal

to attract someone's attention:

The advertisement is designed to grab people's attention.
TAKE OPPORTUNITY

B2 If someone grabs a chance or opportunity, they take it quickly and with enthusiasm.

(Definition of “grab verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)