Running or performing extremely smoothly, especially (music, slang) playing perfectly, perfectly in sync with others, or with perfect focus.
Used other than figuratively or idiomatically: see in, groove.
To rear, bring up, raise.
To rear, rise up, start backwards.
Thin; of low density.
Very uncommon; scarce.
Particularly of meat, especially beefsteak: cooked very lightly, so the meat is still red.
Good; enjoyable.
A scarce or uncommon item.