Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Conceal

Conceal, like cosmetics.
—Osman Edwards

Concealed,
Like some fair bud close folded in its sheath,
Gives not to view the blooming of its beauty.
—Kalidasa

Sorrow concealed, like an oven stopped,
Doth burn the heart to cinders.
—William Shakespeare