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What does 'pull me under' mean? Why not 'pull me down'? 'Under'?? Is this expression grammatically correct? I don't find any entry for that phrase in my dictionaries...
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An ocean wave, or worse--a shark or a gator, can 'pull you under'. Usually there is an implied object or place under which you are pulled...and it doesn't have to be as nasty as a sea monster.

Or are you looking for a grammatical explanation?
Comments  
Or are you looking for a grammatical explanation?

Not really this time.

Actually, this one is a great grammatical explanation:

there is an implied object or place under which you are pulled

Thank you, davkett!