The Collaborative International Dictionary
Clover \Clo"ver\ (kl[=o]"v[~e]r), n. [OE. claver, clover, AS. cl[=ae]fre; akin to LG. & Dan. klever, D. klaver, G. klee, Sw. kl["o]fver.] (Bot.) A plant of different species of the genus Trifolium; as the common red clover, Trifolium pratense, the white, Trifolium repens, and the hare's foot, Trifolium arvense.
Clover weevil (Zo["o]l.) a small weevil ( Apion apricans), that destroys the seeds of clover.
Clover worm (Zo["o]l.), the larva of a small moth ( Asopia costalis), often very destructive to clover hay.
In clover, in very pleasant circumstances; fortunate.
Sweet clover. See Meliot.
Wiktionary
a. 1 (context idiomatic English) In a condition of prosperity. 2 (context idiomatic English) happy and contented. alt. 1 (context idiomatic English) In a condition of prosperity. 2 (context idiomatic English) happy and contented.
Usage examples of "in clover".
And suddenly Peter realizes that if Ellis should die before Aomola, he will still be in clover.
One end was attached to the center pole and Hotspur held the other above his head to make a barrier in Clover Lee's way.
Yesterday's horror was too vivid in Clover's mind ever to be washed away, yet the placid scene below was lapping at the edges of his recollection, and he had to keep jerking his mind back to the reality that these particular men in white were doctors of death, and America's mortal enemy.