n. A sturdy box with a lock for keeping valuables in.
the GNU version of the Collaborative International Dictionary of English
n. A box of rigid and durable construction fitted with a lock, used for the purpose of protecting valuable items, such as jewelry or money.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a strongly made box for holding money or valuables; can be locked
Word Usage
"The strongbox is not large enough that a computer fit in it. (old English) the strongbox is not large enough that a computer would fit in it. (new English)"