grin

virnistää, virnuilla, hymyillä leveästi, virnistellä

virne A smile in which the lips are parted to reveal the teeth.
1997, Linda Howard, Son of the Morning, Simon & Schuster, pages 364:

When the ceremony was finished a wide grin broke across his face, and it was that grin she saw, relieved and happy all at once.

(ux)

Grinned horrible a ghastly smile.

"Mid-Lent, and the Enemy grins," remarked Selwyn as he started for church with Nina and the children. Austin, knee-deep in a dozen Sunday supplements, refused to stir; poor little Eileen was now convalescent from grippe, but still unsteady on her legs; her maid had taken the grippe, and now moaned all day: "Mon dieu! Mon dieu! Che fais mourir!"

The pangs of death do make him grin.

They burned the old gun that used to stand in the dark corner up in the garret, close to the stuffed fox that always grinned so fiercely. Perhaps the reason why he seemed in such a ghastly rage was that he did not come by his death fairly. And why else was he put away up there out of sight?—and so magnificent a brush as he had too.

Like a bird that hasteth to his grin.