slider
US /ˈslaɪ.dɚ/
UK /ˈslaɪ.dɚ/

1.
a small sandwich, typically served on a small bun, often as an appetizer or part of a meal with multiple small items
:
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We ordered a plate of mini cheeseburger sliders for the table.
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The restaurant is famous for its pulled pork sliders.
2.
a person or thing that slides
:
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The baseball player was a fast slider into second base.
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The camera has a smooth slider for cinematic shots.
3.
a type of pitch in baseball that breaks sharply downward and away from the batter
:
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The pitcher threw a nasty slider that the batter swung at and missed.
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His fastball is good, but his slider is his best pitch.