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Some units have an ability where they inflict mortal wounds when they moved over an enemy unit. For example screamers :

Slashing Dive: In your Movement phase, after this unit ends a Normal move, you can select one enemy unit it moved over during that move and roll one D6 for each model in this unit: for each 4+, that enemy unit suffers 1 mortal wound.

What exactly is meant by "moving over" ? Is it enough if a tiny part of any screamer model barely moved over the base of any enemy model ? Does it mean that the entire base of a screamer has to move over an enemy model ? Or is part of the base enough to trigger the slashing dive rule ? Can a screamer hover over an enemy model in mid air, and then move back to where it started ? Does this count as "moved over" ?

LaurentLamar wrote:
Some units have an ability where they inflict mortal wounds when they moved over an enemy unit. For example screamers :

Slashing Dive: In your Movement phase, after this unit ends a Normal move, you can select one enemy unit it moved over during that move and roll one D6 for each model in this unit: for each 4+, that enemy unit suffers 1 mortal wound.

What exactly is meant by "moving over" ?

LaurentLamar wrote:
Is it enough if a tiny part of any screamer model barely moved over the base of any enemy model ?

The base of the enemy doesn't have to be involved. Think about flying over something like a Necron Doomsday Ark or some other vehicle on a flying base.
Best though if you make sure that some part of your own base is passing over part of the enemy - avoids arguments.

LaurentLamar wrote:
Does it mean that the entire base of a screamer has to move over an enemy model ?

No. Just a bit will suffice.

LaurentLamar wrote:
Or is part of the base enough to trigger the slashing dive rule ? Can a screamer hover over an enemy model in mid air, and then move back to where it started ? Does this count as "moved over" ?

Yes, yes, & yes.

Yes.

Do you have a rule citation where "moved over" is defined which i could quote when it comes to disagreement ?